Attwood Aerator Pump 500 - Pumps 500 GPH at open flow, up to 325 GPH at 3 foot head. Ideal for small boats or boats with single, standard-capacity livewells. 1-1/2" inlet for recirculation pump. 12-volt D.C., CE rated. The threaded outlet on this aerator pump can be converted for hose connection. Use one of the Thread-to-Barb connectors (included with aftermarket pump) or Flow-Rite Qwik-Lok couplers.