Rear Competition Edition Air Locker by ARB. Engineered and manufactured in Australia, the competition Air Locker has been designed around the requirements of top-flight ULTRA4 racing. Each technical advancement addresses a specific concern from teams competing in the world’s toughest 4x4 events and is a direct result of testing within these same races. This Air Locker is for the top-tier racer or the hardcore enthusiast who demands the best equipment for their vehicles. Everyone can benefit from the research and development ARB has committed to the competitive racing circuits.