Air Release Valve Inlet Size 1 in Outlet Size 1/2 in Application Clean Water Min Pressure 5 psi Max Pressure 150 psi Max Vent Capacity 55 scfm at 150 psi Connection Type FNPT Max Fluid Temp 250 Degrees F Vacuum Pressure 29 in Hg Body Material Cast Iron Float Material 316 Stainless Steel Standards NSF61 ASTM A126 Class B