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With ARB Air Lockers, you have the benefits of an open differential. This Air Locker System is a locking differential system that utilizes a dash mounted electric switch that is used to activate a vacuum diaphragm that engages the locker. The air locker uses a small charge of air that comes from on board air compressor that further activates the locker. When activated, both axle shafts are locked together providing 100% equal traction to both wheels of that axle