3AN Straight Thread O-Ring Port Plug Black

The 3AN Straight Thread O-Ring Port Plug Black from REDHORSE PERFORMANCE is a precision hydraulic and pneumatic fitting designed to seal unused ports in high-pressure fluid systems. This plug serves as a critical component in custom fuel systems, brake lines, and transmission cooler installations where port management and system integrity are essential. Whether you're building a race car, restoring a classic vehicle, or engineering a specialized hydraulic application, this fitting ensures leak-free performance by properly capping off unused 3 AN ports.

Constructed from aluminum and finished in black anodized coating, the 3AN Straight Thread O-Ring Port Plug delivers corrosion resistance and durability in demanding environments. The straight thread design with integrated O-ring seal eliminates the need for external sealant tape, providing a cleaner installation and more reliable long-term performance. The hex head allows secure installation and removal using standard wrenches, while the O-ring accommodates minor thread variations common in motorsports applications. This fitting is rated for the pressures and temperatures encountered in modern automotive fuel, coolant, and hydraulic systems.

Professional fabricators, engine builders, and high-performance technicians rely on REDHORSE fittings for their superior craftsmanship and compatibility with industry-standard 3 AN port configurations. The plug is ideal for custom fuel injection systems, turbo oil supply lines, transmission coolers, and any application requiring sealed port protection. Installation is straightforward—thread the fitting hand-tight, then use a wrench on the hex head to achieve final pressure-tight sealing. For maximum longevity, ensure the port threads are clean and free of debris before installation.