Average Lead Content: Lead Free | Brand Name: NDS | Inlet Diameter: 1/2 in. | Material: Plastic | Maximum Pressure: 150 psi | Maximum Temperature: 140 deg. F | Minimum Temperature: 40 deg. F | Outlet Diameter: 1/2 in. | Packaging Type: Bulk | Valve Type: Spring Loaded | Activation: Pressure Driven | End-to-End Length: 4-1/8 in. | Fits Pipe Size: 1/2 in. | Minimum Opening Pressure: 0.5 psi | Mounting Orientation: Horizontal/Vertical Spring Check Valve. 1/2 lbs. spring gives positive seal with no back pressure. Reinforced Poppet. Designed for any system where back flow is not desired. Spas, swimming pools, industrial and irrigation. Complies with all applicable ASTM and ANSI standards. UL recognized spa component. | PVC Spring Check Valve | FPT x FPT | Prevents back flow and keeps prime in water systems | 1/2 pound spring gives positive seal with no back pressure | 140 Degree F max. | 150 PSI max working pressure