6AN Straight Thread O-Ring Port Plug Clear

The 6AN Straight Thread O-Ring Port Plug Clear from REDHORSE PERFORMANCE is a precision hydraulic component engineered for high-performance fuel, coolant, and oil line systems in custom automotive builds. This adapter plug seals unused AN ports on manifolds, fuel rails, and distribution blocks, preventing fluid leakage and contamination in modified engine bay setups. Whether you're building a turbo fuel system, upgrading to a larger cooler circuit, or reconfiguring feed-and-return lines, this straight-thread port closure maintains system integrity while keeping your installation clean and professional.

Manufactured to JIC (Joint Industry Council) 6AN specifications, this port plug features a machined straight thread design paired with an O-ring seal that eliminates the need for thread sealant tape, reducing assembly time and improving reliability under pressure cycling. The clear finish allows visual confirmation of the seal and simplifies inventory management in a well-organized garage or shop. The compact 2.8" overall length and lightweight 0.06 lbs construction make it ideal for tight engine bay layouts where space is at a premium, such as in LS-swapped vehicles, fuel-injected conversions, or twin-turbo installations with custom manifold plumbing.

Mechanics and fabricators working on street performance cars, race builds, and fuel system upgrades benefit from REDHORSE's reputation for consistency and fitment accuracy. This plug pairs seamlessly with standard 6AN male adapters and fittings found on aftermarket fuel pressure regulators, surge tank bulkheads, and block-mounted distribution blocks. Installation is straightforward—hand-tighten or use a wrench for final torque without over-cinching, which could damage the O-ring seal. Stock multiple plugs for future modifications or redundant feed systems where line flexibility is essential.