Our Locker Sensor Plug & Air Line Actuator Plug Kit is a must when using an aftermarket locker in a Tera44 or Rubicon-style front axle housing. Works with all aftermarket lockers. The Locker Sensor Plug blocks off the factory electronic locker hole in a Tera44 or Rubicon-style front axle housing. The Air Line Actuator Plug is machined to accept the ARB air line bulkhead as well as accept the rubber grommet used in the Rubicon�s factory E-Locker for a clean and easy install with no drilling required.