KP3991-50 - Lincoln Electric Magnum PRO AL Aluminum Conduit Liner, 50 ft

Smooth Feeding for Your 50-Foot Aluminum Runs

If you are welding aluminum with a 50-foot push-pull gun, you know that the liner is the lifeline of your operation. The Lincoln Electric KP3991-50 Magnum PRO AL Conduit Liner is the genuine OEM replacement part you need to keep your Magnum PRO AL gun running smoothly. Welding aluminum is already tricky enough without fighting your equipment; a worn-out or clogged liner can turn a simple job into a nightmare of burn-backs, stuttering wire feed, and the dreaded bird-nesting at the feeder.

This liner is specifically designed for the unique demands of aluminum wire. Unlike steel liners which can scratch and shave soft aluminum, this liner uses a low-friction material that allows the wire to glide effortlessly through the entire 50-foot length of the cable. When you are working far away from your power source—maybe up on a scaffold or inside a large tank—you need to trust that when you pull the trigger, the wire is going to be there instantly and consistently. The KP3991-50 ensures that the push motor at the feeder and the pull motor in your gun can work together perfectly, without the wire getting hung up in the middle.

Replacing your liner is one of the cheapest and most effective ways to fix feeding problems. If you have noticed your arc starting to wander, or if the wire speed seems to fluctuate even though you haven't touched the settings, it might be time for a swap. Over time, liners get clogged with dirt, shop dust, and tiny flakes of aluminum. A fresh KP3991-50 restores that factory-fresh feel to your gun. It installs easily into your Magnum PRO AL setup, meaning you can get back to laying down dimes in no time.

Don't settle for generic liners that might not fit right or could damage your expensive push-pull gun. This Lincoln Electric liner is built to the exact specs required for your equipment. Whether you are fabricating boat hulls, repairing trailers, or working on architectural aluminum, keeping a spare KP3991-50 in your toolbox is smart insurance against downtime. Keep your feed smooth, your arc stable, and your welds looking professional with the right liner for the job.