Air Release/Air Vacuum Valve Inlet Size 3 in Outlet Size 3 in Application Clean Water Min Pressure 5 psi Max Pressure 300 psi Max Vent Capacity 25 scfm at 300 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