Rule 12V Shower Drain Box with 800 GPH Pump

The Rule shower drain box combines a collection chamber, automatic float switch, and 800 GPH pump into a compact 12V gray-water drainage system. Water from a shower or other compatible drain enters the box, and the internal switch starts the pump as the level rises before shutting it off after the tank is emptied.

Three inlet ports provide flexibility for routing drain hoses into the enclosure, while the quick-release lid makes the internal strainer easier to reach for routine cleaning. Keeping hair and debris at the strainer helps protect the pump and supports dependable drainage in marine shower and sink applications.

Confirm electrical supply, drain-hose sizes, discharge routing, venting needs, mounting location, and service clearance before installation. Mount the box where the lid and strainer remain accessible, secure all hose connections, and test automatic cycling with clean water. Keep the strainer clean to reduce restriction and overflow risk. See the rest of our bilge and water pumps.

• The internal float switch starts and stops the pump as the collection box fills and empties.
• Three inlet ports provide flexible hose-entry options.
• The quick-release lid simplifies routine cleaning.
• The internal strainer captures material before it reaches the pumping mechanism.