Rule G.P.H General Purpose Centrifugal Pump 3800. Heavy duty construction for use on commercial or pleasure boats. 1-1/2" (38mm) inlet and 1-1/2" (38mm) discharge outlet. The Rule General Purpose Pump must be mounted below the waterline. It does not deliver high pressure nor is it self priming. It delivers lots of water but at low pressure. 12 volts DC unless noted. Specifications for Rule 3800 G.P.H General Purpose Centrifugal Pump: Manufacturer: Rule Color: Black Voltage: 12 volts Features of Rule 3800 G.P.H General Purpose Centrifugal Pump Gallons Per Minute: 61 Volts: 12v Package Contents: Rule 3800 G.P.H General Purpose Centrifugal Pump Rule 17A: G.P.H General Purpose Centrifugal Pump 3800