Jabsco 12 VDC Macerator Pumps Jabsco macerator pumps are the ideal answer to simple holding tank pump-outs. The macerator section grinds waste into small particles so it easily passes through the pump's 1" hose barbed discharge port. The pumps are self-priming and can empty a typical 30 gallon holding tank in less than 3 minutes. Pump may be permanently installed onboard for easy holding tank evacuation when outside the 3-mile no-discharge limit. The intake port has both a 1 " hose barb for easy attachment to waste hose and 1 " male pipe thread to screw directly into a tank flange or other pipe fitting. The DC voltage pumps meet the applicable section of the USCG Electrical Regulation (Title 33, Chapter 1, Part 183, Subpart 1).