Description Franklin Fueling (FE Petro) 400818921 CONTROL BOX, WITH SWTCH AND LOCKOUT, STP-CBS. latches line power to the submersible when the relay is energized by a dispenser signal. Key Features Incorporates an “ON/OFF” lockout switch. Relay energized with 110 Volt dispenser/hook signal. Franklin Fueling Systems is an ISO 9001 certified manufacturer.