AN To NPT Swivel 90 Deg -4 x 1/8in

The AN To NPT Swivel 90 Deg -4 x 1/8in adapter fitting from ALLSTAR PERFORMANCE is a critical component for fuel system, coolant line, and hydraulic brake plumbing in high-performance and custom automotive builds. This swivel adapter bridges two different thread standards—AN (Army-Navy) and NPT (National Pipe Taper)—allowing you to connect lines and components that would otherwise be incompatible. Whether you're fabricating a custom fuel delivery system, upgrading a classic car's cooling circuit, or assembling a purpose-built race engine bay, this fitting eliminates the need for separate reducers or adapters that add bulk and leak points.

The 90-degree swivel design redirects flow at a right angle while allowing rotational movement of the attached hose or line—a feature that proves invaluable during tight engine bay installations where rigid 90-degree elbows would cause stress concentration and fatigue. The -4 AN size (which equals 1/4" hose ID) connects to a 1/8" NPT female port, making this fitting ideal for smaller auxiliary circuits like fuel pressure regulators, block-off fittings, and gauge ports. The swivel feature reduces strain on both the hose and the component port by allowing the hose to rotate freely without twisting the fitting itself, dramatically extending service life in vibration-prone environments typical of performance vehicles.

Fabricators and performance mechanics rely on this adapter when working with aftermarket fuel systems, turbo plumbing, nitrous systems, and custom cooling solutions where OEM fittings don't exist. The compact 2.5-inch length ensures it fits into tight spaces without requiring excessive hose routing. Installation requires basic wrench work—thread the NPT end into the component port with appropriate sealant (PTFE tape or thread-locking compound), then connect your AN-sized hose or line to the swivel end. This fitting is essential inventory for anyone building LS swap fuel systems, carbureted hot rods, or any application requiring clean, leak-free connections between dissimilar thread standards.