High Flow AC Utility Rotary Vane Pumps. The 300V has an open flow rate of 20 GPM. This pump provides long life. Explosion-proof UL listed dual voltage 1/2 HP motor (115 and 230 VAC) Motor has sealed bearings, heavy-duty switch and thermal overload protection Built-in junction box Cast iron pump housing with iron rotor and carbon vanes . Check valve, pressure relief valve and strainer assembly. Automatic bypass valve, Fits to standard tank adaptors.