Adapter 1/8in NPT to 1/2in NPT

The Adapter 1/8in NPT to 1/2in NPT from QUICKCAR RACING PRODUCTS is a straight brass fitting designed to bridge two different port sizes in fluid systems common to marine engines, fuel delivery lines, and pressurized boating applications. Whether you're upgrading a fuel line assembly, installing new gauges, or adapting legacy equipment to modern plumbing standards, this adapter solves the challenge of connecting incompatible thread sizes without requiring custom fabrication or workarounds.

Machined from brass, this straight adapter features a 1/8 inch NPT female port on one end and a 1/2 inch NPT male port on the other, allowing seamless transition between smaller-diameter gauge or sensor lines and larger-diameter fuel or coolant hoses. The National Pipe Taper (NPT) threading standard ensures reliable sealing under pressure—critical for fuel systems where leaks can compromise safety and performance. The compact profile (3.5 x 0.88 x 4.5 inches) fits easily into tight engine bays, and the modest 0.1-pound weight means zero impact on your boat's weight distribution or balance.

Anglers, racing enthusiasts, and marine technicians rely on this adapter when retrofitting fuel injection systems, installing aftermarket pressure or temperature sensors, or connecting flow-control devices to existing manifolds. Use thread sealant tape or pipe dope on all NPT connections to prevent weeping under vibration and thermal cycling—standard practice for any marine plumbing work. Compatibility extends to any NPT-threaded component; verify your port sizes before ordering to ensure a proper fit for your specific application.