Replacement pump for AP36 Water Pressure Pumping System 40psi 4.5gpm maximum flow, 12VDC 12amps max, Demand switch, EPDM valves, Santoprene diaphragm, 3/4" barb - plug in ports - Water transfer pump.
Designed for use with expansion tank bladder. Failure to use bladder will decrease pump life.
Use of this pump without an expansion tank will void warranty. If you don't have an expansion tank see pump AP38 or AP63