Rule Shower Drain Box w/1100 GPH Pump - 24VShower Drain Box with 1100 GPH Pump 24V This compact, full capacity shower drain system provides 1100 GPH (4164 LPH) of output. Activated by a float switch, it turns on as the tank fills and shuts off when its empty. It has three inlet ports that offer varying combinations for the inlet hose, as well as a quick release tank lid and an easy clean internal strainer.