NDS 1001-20 2" PVC F by F 7" Length Spring Check Valve High-Impact PVC type II material for use in hot or cold fluid systems up to 140 Deg. F Connections: 2-inch flip by 2-inch flip 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