Ballast Pump Today"s Wakeboard and Ski tow boats need to be able to take on water ballast to modify their wake formation. A development of our tried and tested Puppy Pumps lets these specialist craft rapidly take on and dump ballast, while modern electronics guard against dry running damage to the impeller The choice of motor boat builders for ski and wakeboard ballast systems. Unique impeller compount Handles debris Reversible 8 GPM flow Easy service