Talulah Ballast Pump, 13.5 GPM - 12 Volt | Johnson Pump 10-24690-18 Robust ballast pump is designed to quickly fill or drain ballast tanks on wakeboard and ski boats. 12 volt DC operation F4B-11 model pump Heavy duty construction for continuous duty usage Bronze body for pump longevity With the purchase of a polarity reversing switch 01-47196, the pump is capable of pumping in both directions for filling or draining ballast tanks Thermal overload feature for added pump protection 1 in. inside diameter hose or 1/2 in. NPT inlet and outlet connections Neoprene impeller is designed for waterhandling only Complies with ISO 8846 Marine (Ignition Protection) 25 amp fuse or breaker size 8 in. length x 4.72 in. width x 3.54 in. height