The Jabsco Macerator Pump reduces waste so it easily passes through hoses and thru-hull fittings. 1" hose barb discharge port. Pump is self-priming and can empty a 30-gallon holding tank in less than 3 minutes. 12V, 20 amp. 3-3/8"H x 4-5/8"W x 10-3/8"L.