The TOTO ECOPOWER 0.5 GPM 20 Second Continuous Water Supply Controller Valve for Touchless Bathroom Spouts is designed for use with compatible TOTO ECOPOWER spouts. The ECOPOWER faucet is ideal for high-traffic commercial spaces and provides an elegant water conservation solution. Powered by the force of running water, ECOPOWER hydro-turbines create an electrical current that is stored in rechargeable cells to power the Smart Sensor System of the faucet. The ECOPOWER faucet is highly efficient, replenishing power stores in as little as five uses daily. No external power source or battery replacement is necessary. The ECOPOWER 0.35 GPM 20 second on-demand controller uses only 0.12 gallons per cycle and is CEC and CALGreen compliant. The water will flow continuously for 20 seconds, preventing water waste from the faucet being left running. Included: controller and mounting hardware. Purchased separately: compatible spout, water supply line for G1/2 connection, and optional mixing valve for water that is not pre-mixed.