Aqua King II Automtic Fresh Water Pump, 12V 

"Four chamber design for smooth flow at all demand levels. No rapid cycling. Designed and built specifically for the harsh marine environment, they are dry self-priming up to 6' and can run dry without damage. Featuring sealed motor and pressure switch in a seamless, E-coated housing for superior longevity. Ignition protected, thermal breaker. 2.0 GPM pumps handle 1-2 fixtures, larger pumps handle multi-fixture installations. Includes fittings (swivel straight adapter 1/2-14 NPT x 1/2" barb (Qty. 2).
4138 Series are direct replacements with same mounting bracket as Aqua King 3901."

GPM: 3, PSI: 55, Volts: 12, Amps: 6.5, Size: 8-1/8" x 5" x 4-1/8"

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