A full-capacity shower drain system with automatic activation. Includes a clear, screw-down cover for easy inspection, removable strainer for easy cleaning, and an internal check valve to prevent back siphoning. 800gph capacity. Consists of a bilge pump, Rule-A-Matic float switch and an enclosing sump. Includes three inlets (one 3/4", one 3/4" or 1", and one 1-1/8" or 1-1/2") and one 3/4" outlet.