ARB Air Locker for GM 9.5", semi-floating. The Air Locker uses an air line running off a small compressor (sold separately) to engage the locking mechanism to provide 100% power to both tires. ARB offers a one year warranty against manufacturing defects on this unit. A complete Air Locker kit – replacement differential, activation switch, solenoid valve, air line and bulkhead fittings. Please note - not all units are supplied with replacement carrier bearings.