NDS 1001-10 1" PVC IPS Spring Check Valve 5-1/4" Length High-impact PVC type II material for use in hot or cold fluid systems up to 140 deg. F Connections: 1-Inch FIP by 1-Inch FIP 150 PSI working pressure at 73 deg. F 1/2 pound spring gives positive seal with no back pressure Complies with all applicable ASTM & ANSI standards