Pump Mounted Reversing Switch. Self-priming, instantly reversible and are capable of operation in either direction. Their relatively high flow makes them suitable for general purpose duties such as deck wash, bilge pumping, fuel transfer, ballast transfer and oil change. Ignition protected motor, #316 stainless steel shaft. 6.5 GPM. 1/2″ NPT + garden hose adapter. 12 volt. Note: Do not pump gasoline or other explosive liquids.