Mr. Gasket AN Port Cap Fittings

Mr. Gasket AN Port Cap Fittings are precision-machined components engineered to seal unused AN (Army-Navy) ports across high-performance fluid systems. Whether used on fuel rails, oil lines, brake circuits, hydraulic distribution blocks, or intake manifold ports, these cap fittings deliver reliable, leak-free protection while maintaining a clean, professional appearance on any AN-plumbed assembly.

Key Features:

• Precision-machined construction — engineered for accurate thread engagement and a secure, leak-free seal on standard AN fitting ports
• Performance-grade materials — built to withstand the demanding conditions of fuel, oil, and brake fluid environments found in racing and high-performance street applications
• Clean, professional finish — delivers a polished, completed look on any AN-plumbed component, from dedicated race cars to custom street builds
• Versatile application — ideal for capping unused ports on fuel rails, distribution blocks, intake manifolds, and other AN-plumbed assemblies
• Broad size coverage — the product line spans a wide range of AN thread standards, ensuring a proper match for virtually any fitting configuration
• Trusted performance value — race-quality port protection at an accessible price, consistent with Mr. Gasket's decades-long commitment to the performance aftermarket

A cornerstone of the performance aftermarket since 1964, Mr. Gasket — now part of the Holley Performance family of brands — has long been the choice of builders, racers, and enthusiasts who demand reliability under pressure. These AN port cap fittings are an essential finishing component for any AN plumbing installation, ensuring every unused port is properly sealed, professionally finished, and ready for the demands of competition or performance driving.