1/4 Npt Female Weld Fit.

The 1/4 NPT Female Weld Fit bung from EARLS is a precision-engineered aluminum fitting designed for fuel system applications where a permanent, leak-free connection is critical. This weld-on bung serves as a port closure or adapter point in custom fuel lines, carburetors, fuel tanks, and injection systems across automotive, marine, and powersports platforms. Professionals and builders choose weld fittings when reliability and vibration resistance are non-negotiable—threaded connections alone cannot match the structural integrity of a welded joint under high-pressure or high-vibration conditions.

Constructed from lightweight aluminum with a natural finish, this 1/4 NPT female bung features a weld-on design that creates a permanent, seamless integration into fuel system components. The NPT (National Pipe Thread) female port accepts standard NPT male adapters, hoses, and gauges, providing a universal interface for fuel lines, fuel pressure regulators, and gauge fittings. The weld-on base eliminates the need for secondary fasteners or sealant compounds, reducing potential leak points and simplifying system assembly—once installed via TIG or MIG welding, the connection becomes part of the substrate itself.

This fitting is ideal for custom fuel tank fabrication, EFI conversions, carburetor modifications, and high-performance engine builds where system integrity must withstand sustained pressure and engine vibration. The compact 2.2 x 0.9 x 2.4 inch footprint and minimal 0.03 lb weight make it suitable for tight installation spaces without adding significant mass. Installation requires basic welding skills and proper surface preparation of the parent material; ensure the mounting surface is clean and free of paint or coatings before welding to achieve a strong, corrosion-resistant joint.