#3 St. Bulkhead

The #3 St. Bulkhead is a precision straight bulkhead fitting engineered for hydraulic and fluid transfer systems where direct pass-through connections are required. Designed with 3 AN male ports on both sides, this fitting serves professionals in automotive, aerospace, and industrial applications who demand reliable, leak-free fluid routing. The bulkhead configuration allows hose lines to pass through panel walls or engine blocks without compromise to system integrity or flow rate.

Manufactured by EARLS, a trusted name in high-performance plumbing systems, the #3 St. Bulkhead is constructed from aluminum and finished in blue anodized coating for superior corrosion resistance and durability. The anodized surface protects against oxidation and environmental degradation while providing visual identification on complex fluid circuits. The straight-through design minimizes turbulence and pressure drop, maintaining system efficiency across high-flow applications. Each fitting is precisely machined to AN thread specifications, ensuring consistent engagement and eliminating the risk of cross-threading or improper sealing.

This bulkhead fitting is ideal for custom engine builds, race car plumbing systems, and retrofit hydraulic installations where compact, flush-mount connections save space and weight. Installation requires careful thread preparation and appropriate sealant application to guarantee leak-free performance under pressure. The lightweight design—at just 0.02 lbs—makes it suitable for weight-sensitive applications including motorsports and aircraft systems. Compatible with standard AN3 hose and hard line tubing, the #3 St. Bulkhead integrates seamlessly into existing EARLS component networks for modular system design.