Cast Iron Valve, Cast Steel Valve, Ball Valve manufacturer / supplier in China, offering All Types One Way Valve Duckbill Check Drain Valve Seawater Rubber Duckbill Check Valve Flanged or Clamped, Rubber Sewage Disposal Two Way Valve Silicone Rubber Valve Backflow Prevent Duckbill Valve, Weather Resistance Prevent Sewage Discharge Drain EPDM Neoprene Rubber Duckbill Check Valve Flanged or Clamped and so on.