H71 Check Valve: Good Quality but LOW price Size: 1/2"- 8" Also do OEM ... easy installation, particularly suitable for space-constrained adopt, for water, steam, oil products, nitric acid, acetic acid, strong ... used for the link of water, oil, air, gas and otherpipeline.The price is very low,and the quality is ... we can providemalleable pipe fittings OEM service. Low Price Vertical Lift Check Valve