Air Release Valve Inlet Size 1 in Outlet Size 1/2 in Application Clean Water Min Pressure 5 psi Max Pressure 175 psi Max Vent Capacity 6 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 FM NSF61 UL Listed ASTM A126 Class B