HomeSupplier Discoveryarrow-rightElectrical & Electronicsarrow-rightElectrical Control Systemarrow-rightDouble Pump Control Factories & Companies
Filter
Category
More
Management Certification
More
R&D Capacity
Annual Revenue
More
No.of Employees
More
Province & Region
More
about double pump control
  • Technological Innovation
  • Reliable Supply Chains
  • Substantial Manufacturing Capabilities

double pump control6,000+ factories verified

Hunan Leading Science & Technology Development Co., Ltd.

5.0
Main Products:
Pump Control Box, Pump Controller, Pump Control Panel, Water Pump Control Box, Pump Control System, Water Pump Control, Level Control, Pump Pressure Control, Pump Starter, Pump Protection Box
Country/Region:
Hunan, China
Sample Service:
Sample Available
Company Profile:
Established in 2001, LEADING Science &Technology, has been bringing constantly updated water pump control and protection solutions to the global pump manufacturers and users. Today LEADING Science & Technology, as the front runner of the industry, offers a wide range of pump control panels & pump control accessories for the pump control and protection market.

Shanghai Winning Electric Co., Ltd.

11 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Pump Controller
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Our company offers variety of products which can meet your multifarious demands. We adhere to the management principles of "quality first, customer first and credit-based" since the establishment of the company and always do our best to satisfy potential needs of our customers. Our company is sincerely willing to cooperate with enterprises from all over the world in order to realize a win-win situation since the trend of economic globalization has developed with anirresistible force.

GUANGZHOU BEDFORD ELECTRIC EQUIPMENT CO.,LTD.

20 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Inverter; Controller; Multi-Function Energy-Saving Controller; Water Supply Equipment; Constant Pressure Centrifugal Pump; Pump lnverter
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Guangzhou Bedford Electric Equipment Co., Ltd. is a high-tech enterprise integrating the R&D, production, sale and service together, specializing in Bedford series frequency inverters, AC Drives, VFD, VSD, Solar inverter, Solar pumping system, intelligent constant pressure water pump controllers, complete water supply equipment, booster pump syste, special inverter for injection machine and all kinds of motor savers which are widely used on general industry motor, fans, industry washing machine, packing, printing, textile machine, screw air-compressor and other applications.

JOYCE (HK) INTERNATIONAL LTD

5.0
Main Products:
Push Pull Cable, Marine Engine Control, Mixer Control Lever, Auto Control Cable, Heavy Truck Control Lever, Marine Control Cable, Rotary Steering System, Rotary Steering Helm
Country/Region:
Shaanxi, China
Sample Service:
Sample Available
Company Profile:
Joyce (HK) International Ltd is a trading company. We have our own facotary specializes in producing control cable assemblies and control levers, for automobile, heavy duty vehicle, marine, engineering/mining machinery, train and military etc. At the same time, we also cooperate with some other auto partsm, like Knorr Bremes, WABCO, etc. All oringinal parts for different cars, truck...

Zhejiang Monro M&E Co., Ltd.

17 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Pressure Control, Pressure Switch, Float Switch
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
MONRO is located in Wenling, Zhejiang province, which is a industrially development city with convenient transportation. With more than 10 years of production history for pressure controls and flfloat switches. At present, our factory has more than 30 various types of pressure control which used for water pump system and air compressors We are commit ted to professional pressure control development, production and sales. Ourcompany has established ascientifific and effiffifficient quality control system of ISO9001; 2008. Meanwhile, Our products successfully passed TUV(Germany), CE(Europe), some of which have obtained cUL(UL) certificates. We always follow the principle that quality is the point. In the past years, we have built advanced producing and consummate tesing equipment. With professional technicians and managers, our company has established a scientifific and effffcient Quality Control System. Our company is equipped with modern offiffiffice facilities and outstanding management team. We are always devoting ourselves to the implementation of brand strategy, and the guarantee of products' quality. Owing to High quality and favorable price, our products was highly-regarded in China and have been widely exported to Asia, Europe, North and South America, Middle East and Africa market. As adevelopment, production and sales of family fifirms, we aim to provide you the best service and the highest quality. We have ready everything, looking forward to setting up business relationships with customers all over the world. Owing to High quality and favorable price, our product was highly-regarded in China and exported to countries around the world. As a development, production and sales of family firms, we aim to provide you sincere service and high quality.

Shanghai Kaiyuan Pump Industrial Co., Ltd.

24 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Water Pump; Fire Water Pump; Sewage Pump; Water Supply Complete Set; Control Cabinet
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shanghai Kaiyuan Pump Industrial Co., Ltd. is one of the leading pump manufacturers in Shanghai, China, specializing in producing all kinds of water pumps with various and complete specifications. We have two production bases both of which are located in Fengxian District.

Meokon Sensor Technology (Shanghai) Co., Ltd.

14 yrs·5.0
·Manufacturer/Factory
Main Products:
Digital Pressure Gauge, Digital Pressure Controller, Digital Pressure Switch, Digital Electric Contact Pressure Gauge, Temperature and Humidity Table, Pressure Transmitters, Pressure Sensor, Lever Sensor
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
MEOKON is an instrument manufacturer and IoT sensing solution provider based on digital sensing technology. Focusing on "water atmosphere" safety monitoring in multiple scenarios of smart cities such as smart fire protection, smart water services, building parks, and digital factories, it provides "multiple categories of smart sensing terminals, operation and maintenance services directly to customer sites, and smart equipment health management cloud platforms "Three-dimensional Internet of Things solutions are committed to becoming a reliable provider of IoT sensing solutions for users. <br/><br/>MEOKON always focuses on users and scenarios, providing ultra-low power consumption, multi-sensory fusion IoT sensing terminals, including 110 sensing products for "water atmosphere" safety monitoring. Always create first-class digital instrumentation and IoT terminal solutions for user environment monitoring, digital management, and industrial automation. At the same time, it provides a full life cycle management cloud platform and equipment operation management services based on wireless intelligent terminals. <br/><br/>After 10 years of development, MEOKON has become a leader in wireless intelligent terminals for smart city "water and atmosphere" security monitoring. It has been rated as a Shanghai high-tech enterprise, a national-level specialized special new small giant enterprise, and a Shanghai "technological small enterprise". "Giant Cultivation" enterprise, technology-based small and medium-sized enterprises, and Shanghai urban-level R&D center. The company has passed IS09001 production management system certification and SGS system certification, and has a 0.05 level measuring instrument type certificate. The company has more than 90 independent intellectual property rights, and its products have also passed CE Certification, CPA certification, RoHS certification, Ex explosion-proof and other more than 50 authoritative certifications. <br/><br/>MEOKON's sales footprints cover China, the United States, Europe, Southeast Asia, Japan and South Korea and other countries. A service system has been formed with Shanghai, China as the operation headquarters and manufacturing base, and Chongqing Mingkong, Shenzhen Mingkong, Beijing Mingkong, and Wuhan Mingkong as the operation centers. Dedicated to providing users with more comprehensive and faster wireless intelligent terminals and industry solutions. <br/><br/>Since its establishment in 2013, Meokon has insisted on independent research and development and innovation, and has mastered a number of independent intellectual property rights. Actively explore the development and industry applications of digital instruments and wireless intelligent sensing terminals. Technology exploration and product development in many fields such as pressure, liquid level, temperature, temperature and humidity, flow, water flooding, vibration, noise, water quality, gas, etc. It has formed industry technology leadership with multi-sensor fusion, ultra-low power consumption and in-depth scene edge algorithms. Meokon attaches great importance to the in-depth development of products. Through the optimal design of the product's appearance, embedded software, sensors, digital communications and many other aspects, it is more suitable for customers' industry usage characteristics. Many products are industry firsts and have won the trust of customers. Great recognition.

Wuhan Vohoboo Import and Export Trade Co., Ltd.

Main Products:
Overhead Crane, Gantry Crane, Jib Crane, Electric Chain Hoist, European Type Wire Rope Hoist, Intelligent Hoist, Stage Hoist, Air Hoist, End Carriage, Permanent Magnetic Lifter
Country/Region:
Hubei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Wuhan Vohoboo Import & Export Trade Co., Ltd. is a professional manufacturer and exporter engaged in the research, development, production, sale and service of lifting equipment.

Taizhou Ailandar Pump Industry Co., Ltd.

Main Products:
Pump, Deep Well Pump, Sewage Pump, Circulation Pump, Swimming Pool Pump, Submersible Sewage Pump
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Taizhou Ailandar Pump Co., Ltd. is a dynamic enterprise specializing in the research, development, and manufacturing of innovative pump systems. Strategically located in Wenling-renowned as China's "Pump Town"-we leverage deep industry expertise to deliver a comprehensive range of high-performance pumps tailored to diverse applications.

BAOJI XINGYUTENG MEASURE AND CONTROL INSTRUMENTS CO., LTD.

5.0
Main Products:
Pressure Transmitter, Level Transmitter, Temperature Transmitter, Flow Switch, Pressure Sensor, Flow Meter, Pressure Switch, Temperature Switch, Temperature Sensor, Sensor
Country/Region:
Shaanxi, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Baoji XingYuTeng Measure and Control Instruments Co., Ltd., was established in 2007. We are a high-tech enterprise in researching, designing &amp;AMP; Manufacturing of pressure transmitters, pressure controllers, digital pressure gauges, temperature transmitters, temperature gauges, temperature controllers, level measuring instruments and other accessories such as, circuit boards, modules and headers etc.

Shandong Blossom Pump Co., Ltd.

Main Products:
API610 Pump, Vacuum Pump, Slurry Pump, Double Scution Pump, Water Pump, Mud Pump, Sad Pump, Submerged Pump, Motor, Bb4 Pump
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Blossom pump is a Professional water pump manufacturer Established in 2001, our factory has become a famous enterprise in the Chinese market, and our products are exported to Russia Central Asia region Europe, America, Asia and Africa. The high quality of our products has won us high reputation both at home and abroad. The company has core patents, research and development of all kinds of different functions of API610 standard BB series pump For example, the boiler feed water pump with BB4 BB5 structure. BB3 horizontal split multi-stage pump. BB2 series Radial dissection heavy station chemical process pump. BB1 Axial split double suction pump slurry pump, , clean water pump, vacuum pump and other products, Our products are applicable in various fields such as labs, chemical, petroleum, papermaking, pharmacy and food industries, and water and electricity factories. Blossom pump factory covers an area of 40000 square metersand has over 360 employees. We integrate design. Manufacturing, and service to meet the specialrequirements of casting, OEM, and processing. Completed API-Q1 certification and independently deveeloped high-end products such as BB1/BB2/BB3/BB4/BB5/VS6 etc. The products have entered domestic and foreign markets, covering major important fields like petrochemical, coal chemical, power plant, offshore platforms etc. Sales exceeded USD$42, 000, 000.00. Blossom Pump Industry always adheres to the concept of quality as the first production factor, always keeping in mind its mission, strictly grasping every production link, and sincerely inviting international friends to cooperate with us. We will definitely provide high-level quality and timely service to safeguard your hydraulic projects. Blossom Pump Industry looks forward to cooperating with you!

Yantai Winner Electronic & Mechanical Technology Co., Ltd.

5.0
Main Products:
Car Bench, Car Spray Booth, Hose Reel, Car Body Collison Bench, Car Paint Booth, Cable Reel, Car Lift, Wheel Alignment Machine, Welding Machine
Country/Region:
Shandong, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
We, Yantai Winner Electronic&Mechanical Technology, Co., Ltd, focus on providing complete equipment solution for car maintenance and repairing workshop. Now our main products are car body collision bench, truck/cab repair bench, car lift, spray/paint booth, wheel alignment, welding machine, hose reels, etc. Our products are used in many 4S workshop all over the world such as Toyota, BMW, Ford and Suzuki, etc.

Wuhan Rayvanbo Import And Export Trade Co., Ltd.

5.0
Main Products:
Overhead Crane, Gantry Crane, Jib Crane, Electric Chain Hoist, Wire Rope Hoist, European Hoist, Stage Hoist, End Carriage, Permanent Magnetic Lifter, Lifting Equipment Accessories
Country/Region:
Hubei, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Wuhan Rayvanbo Import And Export Trade Co., Ltd is a professional manufacturer and exporter, we are located in Wuhan with convenient transportation access. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction.

Wenzhou Xinyan Electric Co., Ltd

Main Products:
Digital Pressure Gauge, Energy Meter, Pressure Transducer, Pressure Switch, Water Pump Controller, Dual Automatic Power Switch, Self Healing Power Capacitor, Distribution Power Transformer, Diaphragm Pressure Switch, Distribution Box
Country/Region:
Zhejiang, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
We are a manufacturer, producing digital pressure gauge, pressure switch, diaphragm type pressure switch, pressure transducer, DIN rail energy meter,

Donjoy Technology Co., Ltd.

25 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Sanitary Valve, Rotary Lobe Pump, Diaphragm Valve, Sanitary Butterfly Valve, Twin Pump, Mix Proof Pump, Flow Control Valve
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Donjoy built up in 1993, with registered capital RMB105.58 million(about 15million USD). We focus on developing high quality PID process controller, the valve positioner, the flow controller, the valve control unit, high purity process control valve, intelligent self-control valve, high pure pump, Cleaning technology, piping and pressure vessel safety technology, high pure tubing fitting and pipeline accessories. Donjoy's products and technoligy are widely used in biopharmaceutical, food, drink, wine and other industrial fields. Donjoy's innovation solutions meets growing demand in the industry of biopharmaceutical, food and beverage from the whold wold, special the emerging market.

Nanjing Hangjia Electronic Technology Co., Ltd.

11 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Pressure Sensor, Pressure Switch, Water Level Sensor, Flow Meter, Differential Pressure Sensor, Pressure Transmitter, Flow Switch, Magnetic Flow Meter, Level Transmitter, Temperature Transmitter
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Hangjia Technology is founded in 2015. The company is headquartered in Nanjing and has R&D and manufacturing bases in Shenzhen and Wuxi. As a national high-tech enterprise, the company focuses on the R&D, production, sales and service of various sensors, measurement and control systems and the Internet of Things. The company adheres to the product concept of professionalization, customization and intelligence, from technical consultation, professional customization to final on-demand mass production, to help customers optimize the process, create and deliver value.

Feiyang Science and Industry Co., Ltd.

2 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Hydraulic Solenoid Valve, Hydraulic Cylinder, Gear Pump, Hydraulic Valve, Hydraulic Pump, Excavator Cylinder, Hydraulic System, Pump, Hydraulic Parts
Country/Region:
Hubei, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
We are a leading designer, manufacturer, and service provider of hydraulic and pneumatic equipment and systems in China. Our expertise lies in creating customized hydraulic and pneumatic cylinders and systems, offering tailored solutions to meet the unique needs of diverse industries, including steel manufacturing, hydropower engineering, mining, marine, agriculture, and construction.

Ningbo Lili Electric Co., Ltd.

14 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Pressure Control, Pressure Switch, Float Switch, Pressure Gauge, Pressure Tank, Electronic Board, Water Pump, Water Pump Accessories
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
NINGBO LILI ELECTRIC Co., Ltd was established in 1993, it is located in Ningbo, Zhejiang Province. We have about 40, 000 meters square of the building and more than 300 employees. In addition, the transportation around the factory is very convenience, it is close to the YongJin Highway, and the factory is just 1 kilometers away from the Ningbo Airport.

NINGBO SANHE REFRIGERATION CO., LTD.

Main Products:
Compressor, Refrigerant, Copper Tube & Coil, Air Conditioner Parts, Refrigeration Parts, Refrigerator Parts, Service Tools, Buildings Automation, Washing Machine Parts, Car Air Conditioning Parts
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
NINGBO SANHE REFRIGERATION Co., Ltd. Was established in 1998 to supply spare parts for HVAC/R industry. Over the past years, NINGBO SANHE has earned its reputation as the leading supplier among customers due to its experience, professionalism and integrity.

Anhui Wannan Electric Machine Co., Ltd.

31 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Motor, Electric Motor, DC Motor, AC Motor, NEMA Motor, High Voltage Motor, High Efficiency Motor, Premium Efficiency Motor, Slip Ring Motor, Induction Motor
Country/Region:
Anhui, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Anhui Wannan Electric Machine Co., Ltd is one of the top leading motor manufacturers in China, as well known as "Wannan Motor", "Wannan Electric Motor Factory", which was established in year 1958. The company currently has 1800 employees, and the yearly production capacity is 20 million kilowatts.

Nanjing Xiading Electronic Technology Co., Ltd.

5.0
Main Products:
Industrial Remote Control, Crane Remote Control, Hoist Remote Control, Wireless Remote Control, Radio Remote Control, Forklift Remote Control, Truck Remote Control, Trailer Remote Control, Concrete Pump Remote Control, Lifting Remote Control
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Nanjing Xiading electronic technology Co, . Ltd is a leading enterprise in the domestic industrial wireless control industry, focusing on the R&amp;AMP; D, integration and production of industrial wireless remote control systems. Headquartered in Nanjing Development Zone, the company has an operating area of 5, 000 square meters and currently employs 168 people.

NANJING NEWSIV EQUIPMENT CO., LTD.

Main Products:
Machine Center, CNC Machine, Vertical Machining Center, Horizontal Machining Center, Gantry Machining Center, Engraving and Milling Machine, CNC Engraving and Milling Machine, CNC Engraving Machine
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
NANJING NEWSIV EQUIPMENT Co., Ltd is respoonsible for Anhui Gaochuan Sikai CNC Equipment Manufacturing Co, Ltd. which was founded in 1993 and relocated to Ma'anshan, Anhuiin 2021. T is a high -tech enterpnse spedalizing in the design and manufacuing of CNC machine tools. The company's main products have completehindependent intelectual property rights, and multiple seres of products have obtained jiangsu Province High tech product Cerificates. The enterprisehas been recognized as a high-tech enterprie. Since joining China Transmission Group in 2010, the company has been striving for excelence and self. Improvement. On the one hand, with the strong support ot the group, we cooperate with welknown foreign machine tools and aiwanese enterprisesaiming for the quality and performance of interational MID to high end machine tools, paricipating in market competition at domestic pices, andexpanding the market with produt quaity and fat after-sales service as guarantees; On the other hand, we have vigorously caried out modemequipment technological transformation and invested in advanced processing and testing equipment such as imported 3mx6m large guide ralgrinding, large Cic boring and miling machines, gantry miling, and coordinate measuring instrnuments, laying a soid foundation for improvingproduct quality and developing new products.

Elephant Fluid (Hebei) Hydraulic Machinery Co., Ltd.

Main Products:
Hydraulic Pump Part, Hydraulic Pump, Hydraulic Motor, Hydraulic Valve, Mining Dump Truck Parts, Hydraulic Vane Pump and Spare Parts, Gear Pump
Country/Region:
Hebei, China
Sample Service:
Sample Available
Company Profile:
Elephant Fluid Power Advantages:

Xi'an Yunyi Instrument Co., Ltd.

16 yrs
·Manufacturer/Factory
Main Products:
Pressure Transmitter, Dead Weight Tester, Pressure Calibrator, Level Meter, Flow Meter, Density Meter, Pressure Gauge
Country/Region:
Shaanxi, China
Sample Service:
Sample Available
Company Profile:
Xian Yunyi Instrument Co., Ltd. is a professional manufacturer that engaged in the fields of pressure measurement instrument, the chief engineer, Mr Tian has more than 30 years experience on this area, and he is one of the engineers who introduced the Rosemount technology.

Anhui Tpack Import&Export Co., Ltd

7 yrs·5.0
·Trading Company
Main Products:
Vertical Hydroponic, Greenhouse Glass, Dutch Bucket, Greenhouse PC-Board, Hydroponic Nft System, Greenhouse Film, Seedbed, Full Spectrum Grow Light, HVAC System, Grow Container
Country/Region:
Anhui, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Anhui Tpack Import & Export Co., Ltd., located in Luan City, is a professional enterprise with over 12 years of R&D experience, Our team is dedicated to creating top-notch greenhouse systems, offering expert solutions for indoor and under-glass cultivation. With an independent R&D design and service team, develop customized products tailored to different customer needs. Our main business is Greenhouse Film; Greenhouse Glass; Greenhouse PC-board; Blackout greenhouse; Vertical hydroponic; Dutch bucket; Hydroponic NFT System; Seedbed; Grow tent; Full Spectrum LED Grow Light; Grow Container; HVAC System. We provide comprehensive one-stop services, always customer-centric, and recommend personalized configuration solutions based on specific requirements. Supported by our own factory, complete qualifications, and specifications, we offer full customization and OEM/ODM professional services-from R&D design to sample production-tailored to your brand. Our products are exported globally, mainly to Europe, America, Asia, Southeast Asia, the Middle East, and other regions. Welcome to visit and negotiate business with us.

Hubei Tuohang Power Technology Co., Ltd

Main Products:
Marine Diesel Engine, Fuel Injector, Cylinder Liner, Starter Motor, Piston, Connecting Rod Bearing, Fuel Pump, Turbo Charger, ECU, Engine Parts
Country/Region:
Hubei, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
With over two decades of industry expertise and more than 13 years of dedicated export experience, Hubei Tuohang Power Technology Co., Ltd specializes in supplying high-quality diesel engine spare parts to a global clientele. Our commitment to reliability,  competitive pricing, and exceptional service has earned us the trust and long-term partnerships of customers worldwide.  

Yueqing Chuxi Electric Co., Ltd.

11 yrs·5.0
·Trading Company
Main Products:
Sensors, Switching Power Supply, Float Switch, Solid State Relay
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Yueqing Chuxi electric limited Co. Which has been established on 2016 years, and engaged in the production, research, development and technical innovation of sensor, and power supply.