7/16-20 to #3 Stl Crush Washer Seal Adapter (Pr)

The XRP 7/16-20 to #3 Steel Crush Washer Seal Adapter (Pair) from XRP-XTREME RACING PRODUCTS is a precision fitting engineered for high-pressure hydraulic and fuel line applications in marine engines, performance boat systems, and offshore drilling equipment. This straight adapter transitions 7/16-20 male threads to #3 AN male ports using a proven crush washer seal design that has become the industry standard for leak-free connections in salt-air and vibration-heavy environments.

Constructed from nickel-plated steel, this adapter pair resists corrosion in marine settings where moisture and salt spray accelerate oxidation of untreated fasteners. The crush washer seal mechanism creates a positive metal-to-metal contact that eliminates reliance on PTFE tape or thread sealant—critical for systems where chemical compatibility or flow restrictions are concerns. The #3 AN thread (0.375-inch nominal) is the workhorse connector size in marine fuel injection, cooling loops, and hydraulic pressure lines; the 7/16-20 thread accommodates legacy components or direct-mount applications on engine blocks and manifolds. Pair configuration ensures you have replacement hardware on hand for dual-engine setups or redundant system lines.

This adapter serves professional marine technicians, high-performance boat builders, and offshore anglers who demand zero tolerance for hydraulic leaks or fuel seepage. It is equally suited for restoration of classic race boats, retrofit of fuel-injection systems on carbureted engines, and emergency field repair where standardized AN fittings are required. The XRP brand's reputation in extreme motorsports carries directly to marine applications where reliability under load and in hostile salt environments separates functional installations from those prone to failure.