The Rule 98A Multi-Port Shower Drain System is a compact, full capacity shower drain system that automatically turns on after the water starts, and shuts off when the water is removed. Activated by a Rule-A-Matic float switch. Available in single inlet and three inlet ports which offer varying combinations of inlet hose. Other features include a clear screw down cover, a removable strainer for easy cleaning, and an internal check valve to prevent back flow.