St. #3 > 1/8 Npt Adpt.

The EARLS St. #3 > 1/8 NPT Adapter is a straight fitting that connects 3 AN (Army-Navy) male threads to 1/8-inch NPT (National Pipe Thread) male ports. Built from aluminum and finished in blue anodize, this adapter is engineered for reliable, leak-free performance in hydraulic, pneumatic, and fuel line applications where mixed thread standards must interface seamlessly.

The straight configuration allows direct end-to-end connection without directional complexity, making installation straightforward in tight engine bays and confined spaces. The blue anodized aluminum construction resists corrosion while remaining lightweight—critical for racing, marine, and off-road applications where weight and durability compete for priority. The 3 AN to 1/8 NPT conversion is a common requirement in custom fuel systems, transmission cooler lines, and pressure gauge installations where newer AN-spec components must mate with existing NPT threaded ports or older infrastructure.

This adapter is essential for custom builders, restoration specialists, and performance technicians who frequently source components from multiple eras or manufacturers. The NPT thread standard is tapered, creating a mechanical seal that becomes tighter under pressure—a design advantage over parallel threads in low-pressure applications. Sold individually, each adapter handles one connection point; systems requiring multiple conversions will need one adapter per junction.

EARLS fittings are recognized throughout the motorsports and custom fabrication community for consistent thread quality and reliable sealing performance. The compact size and minimal weight make this adapter ideal for applications where clearance and hose routing constraints demand precision fitment without bulk.