7/16-24 to #4 Stl Crush Washer Seal Adapter (Pr)

The XRP-XTREME RACING PROD. 7/16-24 to #4 Stl Crush Washer Seal Adapter (Pr) is a precision fitting engineered for high-performance hydraulic and pneumatic systems in racing and modified vehicles. This straight adapter converts 7/16-24 male threads to #4 AN (Army-Navy) male ports, making it essential for custom fuel, coolant, and brake line routing in turbocharged engines, supercharged builds, and competition applications. Whether you're plumbing a fuel injection system, upgrading a cooling circuit, or integrating aftermarket components, this pair delivers the leak-free performance demanded by serious engine builders and motorsport technicians.

Manufactured from steel and nickel-plated for corrosion resistance, the crush washer seal design creates a reliable, repeatable metal-to-metal seal without relying on thread sealant tape—critical when vibration and thermal cycling threaten connection integrity. The crush washer compresses under torque to fill microscopic surface irregularities, providing consistent sealing across temperature extremes and pressure spikes. Nickel plating extends service life in harsh underhood environments while maintaining the aesthetic appeal of modern engine bays. Each adapter is precision-machined to ANI (Aerospace Industries) tolerances, ensuring exact port alignment and eliminating flow restriction at critical junctions.

This two-piece set suits engine builders upgrading factory fuel rails, installing aftermarket fuel pressure regulators, or integrating custom coolant bypass circuits. Mechanics working on late-model turbocharged platforms, LS swaps, and custom race engines rely on these adapters to bridge legacy 7/16-24 fittings with modern AN-spec plumbing. Installation requires proper crush washer torque procedures—typically 10–15 ft-lbs depending on fitting material—to achieve optimal seal without deformation. Pair these adapters with quality AN hose and stainless steel fittings for a system capable of withstanding 100+ psi boost and sustained high-temperature operation.