Coupling, Valve Parts, Pump Parts manufacturer / supplier in China, offering Weather Resistant 323.9mm/DN300/12′′ Stainless Steel Grooved Coupling for Hose Pipe Clamps, Large Size 273mm/10′′/DN250 Stainless Steel 304 316 2205 2507 Low/Medium/High Pressure Grooved Coupling for Pipe Joining, Manufacturer 139.7mm/5′′/DN125 Stainless Steel 304 316 2205 2507 Low/Medium/High Pressure Grooved Coupling for Pipe Joining and so on.