St. #3 > 1/8 Npt Adpt.

The EARLS St. #3 > 1/8 NPT Adapter is a precision straight-thread fitting designed for custom fuel system, coolant, and fluid line integration in performance and modified vehicles. This adapter connects SAE straight thread (St. #3) ports to 1/8 inch NPT (National Pipe Thread) connections, making it essential for builders upgrading factory fuel rails, aftermarket carburetors, boost controllers, and auxiliary cooling systems.

Manufactured by EARLS, a trusted name in motorsport-grade fluid transfer components, the St. #3 > 1/8 NPT Adapter features a straight-thread design that minimizes flow restrictions and reduces leak potential compared to tapered fittings. Its compact profile of 1.2 x 0.65 x 2.95 inches allows for installation in tight spaces typical of modern engine compartments.

This adapter is ideal for EFI system conversions, fuel pressure regulator installations, nitrous oxide plumbing, turbo cooling lines, and custom gauge mounting on street rods and race cars. The NPT side ensures compatibility with gauges, solenoids, and plumbing hardware, while the SAE St. #3 port mates directly with OEM and performance fuel rail systems.