The Jabsco 18590-series DC macerator pump unit is the ideal solution for emptying holding tanks on recreational vehicles and avoiding dump stations.The macerator section grinds waste down to a particle size of 1/8" maximum so it can easily be pumped through a 1" ID discharge hose. The pump section is self-priming, permitting the unit to be mounted above the tank in a convenient location. Empties most recirculating toilets in less than 2 minutes; empties a typical 30 gallon holding tank in less than 3 minutes.