Riachard, it's mounted between the galley sink and ice box on the counter top. Believe it was put in to get rid of the "drain to bilge" so i can just pump any ice box "clean water to the sink. Also it is just a small whale "flipper" type pump which i 've learned is self priming, guess i just need a kit to repair or replace. thanksfor your reply just trying to cut corners from the wealth of knowledge on the site!