ARB Central Compression Nut Air Locker Bulkhead Fitting

The ARB central compression nut is a replacement part for the Air Locker bulkhead fitting, the air feed connection on ARB air-operated locking differentials. It is also called a center compression nut. It threads into the bulkhead body on the axle housing or differential cover. It clamps and seals the internal copper air line and gives the external air line a connection point.

Key Features:

• Genuine ARB replacement part for Air Locker air system plumbing
• Secures and seals the copper air line where it passes through the bulkhead body
• Works with the ARB outer compression nut and bulkhead body to connect the external air line
• Supports a leak-free air connection for consistent locker engagement and disengagement
• Suited to rebuilding or repairing an existing Air Locker installation, or to new installs

Tighten the nut carefully and follow ARB's installation instructions. Over-tightening can pinch the copper air line and restrict airflow, which slows locking and can cause engagement problems. ARB engineers Air Locker components for off-road use, and a sealed bulkhead helps keep the locker working reliably on the trail.