Replacement ARB electric Air Solenoid. If you run an ARB Air Locker then you know you must have a valve to apply air and release air. ARB supplies a electric Solenoid with all of there Air lockers. If one becomes damaged then the reliability of you lockers are jeopardized. Solenoids come with ARB's standard electric connector and will thread to the 1/8" BSPT fitting for the compressor in let and the "push-in" fitting for the air line out let