Bulkhead AN Straight -20

The Bulkhead AN Straight -20 by Allstar Performance is a premium hydraulic or fuel line adapter engineered for custom engine builds, race cars, and high-performance fuel system installations. This straight-configuration bulkhead fitting serves as a critical pass-through component for bulk head-mounted fuel rails, turbo systems, and custom plumbing layouts where space constraints or symmetrical line routing demand a direct 180-degree configuration. Whether you're assembling a fuel-injected engine swap, upgrading a carbureted platform, or routing braided stainless steel lines through a tight engine bay, this AN fitting provides the reliability and precision fitment that separates professional machine work from improvised solutions.

Constructed to AN (Army-Navy) standard specifications, the Bulkhead AN Straight -20 delivers industry-standard thread engagement and sealing surface geometry that pairs seamlessly with braided stainless, rubber, or polyurethane fuel and coolant lines. The -20 designation indicates a 5/8-inch diameter fitting body compatible with -20 AN hose and adapter configurations, a size commonly paired with fuel distribution blocks, engine block ports, and manifold applications on mid-sized displacement engines. Allstar Performance's manufacturing tolerances ensure zero leakage under pressure cycles, eliminating the common failure points found in counterfeit or undersized fittings that can compromise fuel delivery pressure and engine performance during high-load acceleration or sustained boost conditions.

Mechanics and engine builders favor Allstar Performance bulkhead fittings for competitive drag racing, road course applications, and street-performance restorations where reliability under vibration and thermal cycling is non-negotiable. Installation requires standard -20 AN wrench sets and basic familiarity with fluid system assembly—torque to manufacturer specification and verify thread sealant or crush-washer compatibility with your fuel or coolant medium. This fitting integrates directly into fuel rails, turbo feed blocks, and custom intake manifolds, making it ideal for EFI conversions, LS engine swaps, and small-block or big-block modifications where factory hard-line plumbing is unavailable or incompatible with your intake or injection geometry.