Hand Operated Drum Pump Action Type Piston Wetted Materials Aluminum Buna-N Delrin(R) Seal Material BUNA-N Piston Material Aluminum GPM 10 Max Pressure 38 psi Ounces per Stroke 25 oz Max Viscosity 50 SUS Inlet Size 1 in NPT Outlet Size 3/4 in NPT Overall Length 6 Metered No Adapter Material Cast Iron Features Anti-Siphon Valve Can Be Used to Pump In Reverse Direction Piston Hand Pump Standards UL Listed