Feature:
(1)dual valve, closting and latching speed controlled by two separate requlating valves.
(2)universal applicatin: Standard, top-jamb, parallel arm installations.
(3)standard packing no include parallel arm bracket. The bracket be provided upon request.
(4)reionforced type adjustable tube arm.
(5)rack and pinion operation contained in a high tensile precision cast aluminum housing for the highest quality.
(6)high quality hydraulic fluid for high lubricity and constant lubrication.
(7)optional back check (503bc, 504bc, 505bc), controlled by separate regulating value.
(8)finish selection: Silver(alum), bronze(duro), gold. Any other finishes is available upon request.