For Use With 30 Spline Axles and 3.91 And Up Gears At the flick of a dash-mounted switch, compressed air is delivered to the seal housing assembly via a nylon air line. Requires Air Compressor Sold Separately The ARB Air Locker is a pneumatic locking differential that uses air to facilitate the locking of both axles. This action converts your differential from a conventional open to a full spool type axle supplying 100% power to both wheels to keep you going through the worst terrain. ARB onboard air compressor required to activate Air Lockers. Sold Separately. Brand ARB Manufacturer part number RD111 UPC / GTIN 881348006721 Weight 1.00 lb Dimensions (L × W × H) 10.6 × 10.6 × 11 in Category Engine & Drivetrain Condition New — genuine brand-name part Genuine brand-name part, full manufacturer warranty. Ships from the closest US warehouse — normally within 1–3 business days. Verify fitment with the manufacturer part number above; not sure? Send us your VIN and we’ll confirm before you order. 30-day returns on unused parts.