Ball Valve, Needle Valve, Check Valve manufacturer / supplier in China, offering 304 Stainless Steel 1/2" Female Vertical Check Valve Gas Ball Valve One Way Spring Check Valves CF8 Wog 1000, SS316 SS304 Stainless Steel Manual Power Vertical Thread Lift Spring Water Pump with Vacuum Check Valve for Water Pipe, Stainless Steel 304 316 Non Return Vertical Check Valves and so on.