Without a doubt, this is the most popular wakeboard ballast pump in history. Its success is for good reason; the reversible design simplifies installation and reduces the number of components required. Its track record proves that it's a fast, efficient, reliable performer. With a flow rate of 9 GPM (34 LPM), it can quickly add up to 80 pounds (40 kgs) of water per minute to ballast tank systems. The Jabsco Ballast Puppy is reversible, so it can both fill and empty ballast tanks. It's self-priming and therefore will not air lock. Includes a switch for reversing.