ARB Air Locker Bulkhead Kit For 3.5mm Copper Line

Replacement ARB air locker bulkhead kits.

ARB had used multiple bulkheads over the years, these are two of the most common. Both fit the 3.5mm copper line in the diff, while one uses the newer style BLACK 6mm air line to the solenoid and the other uses the older style BLUE 5mm air line.

These bulkheads are interchangeable, as long as the air line matches the bulkhead you have, i.e. swapping to the new style 6mm bulkhead is feasible as long as the airline and push in fitting on the solenoid is changed at the same time. Both bulkheads use a 1/4" NPT hole in the differential housing