Features: KBI Swing Check Valve experiences insignificant pressure loss due to full flow design. Meets/exceeds ASTM and ANSI standards Made of high-impact PVC type II material Molded in the USA by KBI Swing Check Valve should not be installed with outlet side angled down or facing down 150 psi working pressure (tested to 500 psi static @ 73° F) NSF standard 61 listed