Construction: C360 Machined One Piece Brass Body, 302 Stainless Steel Spring and 15% Glass Filled Teflon Poppet, Valves are 100% Tested for Backflow Leakage Performance, 1 psi Cracking Pressure, Maximum Pressure: 500 psi, Maximum Temperature: 450°F, 1/8” NPT Tapped Port is Standard, 1” & Above Are Repairable, Ever seal 483 Sealant Standard.