Jabsco PAR-MAX 1.9 water pressure system. It is designed for vessels requiring a quiet, smooth flow, on-demand pump. This pump features a three chamber diaphragm design offering a smooth flow from 0.65 GPM to 2.9 GPM, and come with a built-in pulsation eliminator to control unwanted cycling and noise. Self-priming to 3 mt, dry running without damage. Power supply 24V.