This Attwood Model 500 GPH Shower Sump Pump System delivers outstanding performance for fast water flow into and out of the sump. It is so versatile it can utilize multiple inlets hooked up to more than one drain source using different hose sizes. For instance, it can handle inflow from the head sink, shower stall, and galley sink. The standard sump box includes an air vent to prevent air locks. Its lid snaps in to allow quick installation, and for removal for cleaning, and it includes a gasket to seal the sump box against overflow. This Model 500 GPH Sump Pump System has a ¾-inch interior diameter outlet hose, is rated for 12 volts, and uses a 22-inch wire connection. It meets or exceeds all applicable ABYC and USCG standards. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 150 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.