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ARB Rockwell Air Locker comes with the improved two piece design available right across the range, along with the addition of forged gears and an industry leading five year warranty. This ARB Air Locker is now better built and better backed than ever before. Created to provide traction on demand, without sacrificing highway driving performance, ARB Rockwell Air Locker differentials employ a 12 volt ARB air compressor (sold separately) to pneumatically operate a solid and durable locking mechanism inside the differential. It can be installed in both front and rear axles. ARB also offers three compressor models suitable for Air Locker operation, two of which can be used to inflate tires and operate other equipment.