This rugged, positive displacement, Heavy Duty pump is UL listed. Explosion proof UL listed 1/3 HP motor (115 VAC-60Hz) with sealed bearings, Heavy Duty switch, thermal overload protection and junction box. Carbon vanes and ceramic/carbon seals reduce wear and repair expense. Integral check valve with pressure relief on outlet side reduces pressure drop and improves vertical lift. Easy removable strainer, automatic bypass valve, 2" threaded bung for tank openings.