Rotary Vane Pump Body Material Low Lead Brass Inlet/Outlet 3/8 in FNPT Min Flow (GPM) 1 Max Flow (GPM) 1 Relief Pressure Max (PSI) 240 Max Pressure (PSI) 290 External Relief No By-Pass Yes Carbonator Mounting Max Temp (F) 158 Degrees Vane Material Graphite Stainless Steel Shaft