The Cla-Val CTC-33 Electronic Timer Control is a battery-powered, programmable on-off control used for opening and closing Cla-Val main valves according to time schedule. Up to three opening and closing times per day can be set for a weekly schedule. The CTC-33 is used on the 139-10 Programmable Timer Control Valve. The CTC-33 offers powerful valve control for remote locations and valve automation applications.