NDS 1001-10 1" PVC IPS Spring Check Valve 5-1/4" Length Use to prevent back flow and keeping prime in water systems. 1/2 pound spring gives positive seal with no back pressure. Complies with all applicable astm ANSI standards. Features 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 USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.