Rich I have two of them onboard. 12v DC. In 17 years I have replaced them once. They are good units and I buy RARITAN products for their quality and tech support. Call them On the phone and they are there for you. I especially like the way they are designed. Take it out of the box, mount it to your platform hook up the In take Line and variable size discharge line it will take two different size discharge lines and the snap on fittings for hoses is a simple. The button to operate is simple. I have Peggy Halls’s book In my library. When I had to replace them I was on the Great Loop in Canada and talked to the Raritan National Sales Mgr. Does not get any better Bob Kovach Onboard ALLEZ @ Grande Dunes Marina Myrtle Beach SC Sent from my iPhone Chief Engineer Bob Kovach (KJ4UGE) Onboard M/Y ALLEZ! GOLD LOOPER 5-2-2016 MTOA2631, USCG-CWOA, WRCC, AGLCA-1979, USPS CHARLESTON, S.C.