Brass check valve, Brass swing, Casting brass valve.
Size: 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3" 4"
Technical Requirement:  
1). Before assembling, all parts should be clean, no oil or grease, remove all burrs and sharp edges.
2). Before connecting, body cap male thread should be coated with sealing glue.