... :H71H/Y/W2 Usage and features: connection with wafer H71 check valve, compact disc along the center position ... , closing speed, can significantly reduce the hammer. Products to its small size, light weight, nimble, sealing a ... are given for your reference; if you want to learn other pipe fittings infomations,you can e- ... your inquiry,and we will try our best to answer as soon as possible and as detail ...