AN To NPT 90 Degree -4 x 1/8in

The AN To NPT 90 Degree -4 x 1/8in adapter from Allstar Performance is a vital hydraulic and pneumatic fitting designed for precision plumbing in high-performance engine builds, fuel systems, and brake line configurations. This 90-degree elbow adapter connects two different thread standards—AN (Army-Navy) and NPT (National Pipe Taper)—allowing for compatibility between otherwise incompatible components.

The -4 AN size corresponds to a 7/16" bore, making it suitable for mid-range flow applications without sacrificing pressure integrity. This compact fitting is ideal for fuel distribution blocks, coolant bypass lines, and brake proportioning valves. The 90-degree angle orientation saves space in tight engine compartments, and the NPT male thread seats into female NPT ports with a sealed taper joint—no additional PTFE tape required, although many builders apply it for added security.

Engine builders transitioning between metric and SAE systems, as well as those custom-fabricating fuel rails and intake manifold coolant systems, will find this adapter indispensable. Allstar Performance's precision machining ensures dimensional consistency, which is critical when stacking multiple adapters in a single system where tolerance stack-up can cause fitment issues.