42-4045-15 - Tweco Style 42 Series MIG Liner 15ft for .045 Wire

Restore Smooth Wire Feeding with a Fresh Liner

Is your MIG wire sputtering, slipping, or burning back to the tip? Before you blame your welder settings or the drive rolls, check your gun liner. The liner is the unsung hero of the MIG welding process, guiding the wire from the feeder all the way to the contact tip. Over time, liners become clogged with copper shavings, dirt, and shop dust, or they develop kinks from heavy use. This friction causes erratic feeding, unstable arcs, and frustration. The 42-4045-15 Tweco Style Liner is the perfect solution to refresh your 15-foot MIG gun and get back to laying down smooth beads.

Designed specifically for .040" and .045" diameter wires, this steel-wound liner is built to handle the rigors of daily welding. It fits the most popular guns in the industry, including the Tweco #2 and the Lincoln Magnum 250 found in countless shops. The zinc-plated steel construction resists rust and provides a slick path for the wire, reducing the strain on your wire feeder motor. Whether you are running solid mild steel wire or flux-cored wire, this liner ensures the wire is delivered to the weld pool consistently.

Installation Tips:
Installing a new liner is one of the easiest maintenance tasks you can perform to improve weld quality. Simply remove the nozzle, contact tip, and gas diffuser from the front of the gun. Disconnect the gun from the machine and loosen the set screw holding the old liner. Pull the old liner out and slide this new one in. Crucial Step: Always lay the gun cable out straight on the floor before trimming the new liner. Most liners need to be trimmed slightly longer than the gun cable to ensure they seat firmly against the diffuser—check your gun's manual for the specific "stick-out" length required. A pair of sharp side cutters or a dedicated liner trimmer will give you a clean cut. Once installed, you'll notice an immediate improvement in arc stability and feed consistency.