High Flow AC Utility Rotary Vane Pumps. With a flow rate few pumps can match. the FR311VN has an open flow rate of 30 GPM. This pump provides long life. Explosion-proof UL listed dual voltage 3/4 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, 2 in. threaded bung for tank openings.