#4 Alm Tube Sleeve

The #4 AN Tube Sleeve from AEROQUIP is a precision-engineered fitting component designed for high-pressure hydraulic and pneumatic systems that demand reliable tube connections. This aluminum sleeve is purpose-built for technicians, mechanics, and engineers working with 1/4-inch tubing in motorsports, aviation, industrial machinery, and heavy equipment applications. The set of six sleeves ensures you have spares on hand for repairs, installations, or system modifications without downtime.

Constructed from aluminum and finished with blue anodizing, the #4 AN Tube Sleeve provides both corrosion resistance and visual identification within complex fluid systems. The anodized coating protects against oxidation while the aluminum construction keeps weight minimal—critical in performance and aerospace applications. This sleeve works in tandem with AN fittings to compress and seal the tube connection, distributing load evenly around the tube end and preventing leakage under vibration and pressure cycling. The compact dimensions (2.3 x 1.1 x 3.75 inches) allow for use in tight engine bays and confined spaces typical of custom builds and retrofit projects.

Anyone upgrading fuel systems, brake lines, or cooling circuits on race cars, classic vehicles, or experimental aircraft will benefit from having multiple sleeves available. Installation is straightforward—the sleeve slides over the tube end before inserting into the AN fitting, where it compresses to form a leak-proof seal. Compatibility with all standard #4 AN fittings (1/4-inch tube OD) makes this sleeve an essential consumable for shops maintaining or building high-performance systems. Keep extras in your toolkit for field repairs and system revisions.