Shower Drain Box with 800 GPH 12V Pump. This compact, full-capacity shower drain system provides 800 GPH (3028 LPH) of output. Activated by a float switch, it turns on when the tank is full and off when empty. It has three inlet ports that offer variable inlet hose combinations, as well as a quick-release tank cap and an easy-clean internal strainer. Specifications: Voltage: 12V. Weight: 4.1 lbs.