JABSCO 18620-0003 12V REVERSIBLE OIL CHANGER PUMP. Bronze body, nitrile impeller, lip type seal. The motor is a reversible permanent magnet type with intergral reversing switch and fuse. Use for circulating and draining bait tanks, changing engine oil, or general pumping. Ports are 3/8" NPT internal and GHT external. Posts: 3/4" Garden Hose External. 3-3/8"H x 8-5/8"L x 4"W. Impeller is 14500003. NOT TO BE USED IN POTABLE WATER SYSTEMS.