Thru-Frame Fittings -3an x 1/8in npt Long

The Billet Specialties Thru-Frame Fittings -3AN x 1/8in NPT Long are precision hydraulic adapters designed for custom automotive applications, including cooling, fuel, and brake line routing in high-performance engine builds. These fittings address the challenge of running hose lines through vehicle frames without kinks or external routing that can affect aesthetics and aerodynamics.

Constructed from durable billet aluminum, these fittings provide essential corrosion resistance for demanding underhood environments. The -3AN port is compatible with standard AN-3 hose, which has a 3/16-inch inner diameter, while the 1/8-inch NPT port allows for direct threading into frame bosses or custom-welded bungs. The extended length design enhances threading depth and reduces stress at the frame junction.

Engine builders and fabricators will find these thru-frame fittings invaluable for creating clean, efficient routing solutions in their projects. Whether upgrading fuel delivery systems or integrating brake lines into a race car, these fittings ensure a professional finish and reliable performance.