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A double action piston pump simultaneously draws new flush water as it discharges the wastewater. By using raw water for flushing, on board water supplies can be reserved.The PHII pump has a unique, easily replaceable seal cartridge. A simple quarter turn of the water control knob allows the bowl to be pumped dry providing the user with the option of emptying the bowl in heavy seas. Size: 14-1/16"H x 19-1/2"D x 17-3/4"W (Marine Bowl)