H71 Check Valve: Good Quality but LOW price Size: 1/2"- 8" Also do OEM service. ... you want to learn other pipe fittings infomations,you can e-mail us. Welcome your inquiry,and we will try ... oil, air, gas and otherpipeline.The price is very low,and the quality is excellent.We believe ourproducts will make ... .Besides,we can providemalleable pipe fittings OEM service. Low Price Vertical Lift Check Valve