42N354515 - Generic 42N-3545-15 Nylon Liner for Tweco MIG Guns (.035-.045 Aluminum)

Reliable Aluminum Wire Feeding

The Generic 42N-3545-15 Nylon Liner is a premium aftermarket replacement designed to restore smooth wire feeding performance to your Tweco® style MIG guns. Specifically engineered for use with aluminum and other soft alloy wires, this conduit solves the common frustrations associated with feeding soft filler metals through standard steel liners. Aluminum wire is prone to shaving, buckling, and "bird-nesting" when pushed through coiled steel liners due to friction and the abrasive nature of the metal coil. This nylon conduit provides a smooth, low-friction path that protects the integrity of the wire and ensures consistent arc stability.

With a length of 15 feet, this liner is perfectly sized for standard torch leads and can be easily trimmed to fit shorter cables if necessary. It is compatible with the popular Tweco No. 2, No. 3, and No. 4 series MIG guns, making it a versatile addition to any welder's toolkit. The liner is rated for wire diameters ranging from .035" to .045" (0.9mm to 1.2mm), covering the most common sizes used in general fabrication and repair work. By reducing drag inside the cable, this nylon liner helps maintain constant wire speed, which is critical for achieving high-quality aluminum welds.

Installation is straightforward and follows the standard procedure for Tweco consumables. Whether you are fabricating aluminum boat parts, repairing trailers, or performing automotive work, switching to a dedicated nylon liner is the single most effective upgrade for your MIG setup. This generic replacement offers professional-grade performance at a fraction of the cost of OEM parts, ensuring you get the job done without breaking the budget.