Relay Devices Automotive Relays Continuous Duty Solenoids Remote Starter Solenoid High Power Relay Sealed Automotive Relay Relay Socket Relay Socket Kit Relay & Socket Assembly Mag Kill Solenoid Relay & Socket Assembly #900-000 12V SPDT 40 amp relay and prewired socket with 12" leads. Many uses include controlling fuel pump, water pump, fans, or any other high current accessory. Diagram included.