TJM Air Compressor Set for Locking Differentials Air Lockers / Prolockers Need a solid compressor made for the rigors of engaging your Air Lockers? This set includes the compressor, wiring harness, power relay, and Dash switch! An invaluable setup for keeping you engaged! You can use this compressor for front, rear, or both air lockers. Ships together in one box. * Please contact us for availability times and costs.