Everflow 210T012-NL 1/2-Inch Lead Free Brass Swing Check Valve with Female NPT Threaded, 200 PSI WOG & 125 PSI SWP Brass Construction Higher Corrosion Resistance Economical Durable & Easy to Install Cast Brass Swing Check Valve With 1/2 Inch Lead Free Constructed Of Brass For Strength And Durability Maximum pressure of 200 psi wog and 125 psi swp; Approved By UPC, NSF Features Metal-To-Metal Seal, Either Threaded Npt Or Solder End Connections Brass Body Brass Swing Check Valves are Used to Prevent Reverse Fluid Flow in Water and Steam Applications