This kit is a must for blocking off the factory electronic locker holes when using an aftermarket locker (ARB E-Locker OXLocker etc) in a Tera44 Rubicon or Dana 44 Rubicon front axle housing. The Air Line Actuator Plug is machined to accept the ARB airline bulkhead as well as accept the rubber grommet used in the E-Locker for a clean and easy install with no drilling required. Works with all aftermarket lockers.