Earl's Performance Aluminum AN O-Ring Port Plugs

Earl's Performance Aluminum AN O-Ring Port Plugs are a professional-grade solution for sealing unused AN O-ring boss ports in fuel systems, oil lines, coolant circuits, and custom performance plumbing builds. Engineered with the same aviation-derived precision that has defined Earl's Performance Plumbing for over five decades, these port plugs deliver the leak-free reliability that serious builders and racers demand.

Key Features:

• Aircraft-Grade Aluminum Construction — Machined from high-strength aluminum alloy for an exceptional strength-to-weight ratio suited to demanding performance applications
• Internal Allen Head Design — A slim, low-profile internal Allen head hex drive replaces bulky traditional hex-head profiles, delivering a cleaner, more attractive appearance on any custom plumbing installation
• Hard Anodized Finish — Available in multiple finish options; the hard anodize coating penetrates the base material to provide superior wear and corrosion resistance that outlasts conventional anodized finishes
• O-Ring Boss Seal Design — Positive O-ring sealing creates a reliable, leak-free connection in high-pressure fuel, oil, and fluid systems — no thread sealants or tape required
• Multiple AN Sizes Available — This product line spans a broad range of AN port sizes to suit virtually any O-ring boss port application, from compact street builds to dedicated competition vehicles
• Made in the USA — Manufactured to Earl's rigorous quality standards as part of the most comprehensive AN plumbing product line available

Earl's Performance Plumbing pioneered the use of aviation fluid transfer technology in the automotive performance market, and these AN O-Ring Port Plugs carry that legacy forward. Whether capping off test ports, finishing a custom fuel system, or completing an oil or coolant circuit, Earl's port plugs provide dependable sealing performance that professional builders have trusted for generations.