230239 - Miller 230239 Teflon Neck Liner for XR-Aluma-Pro 4-Inch Head Tube

Smooth Aluminum Feeding with the Miller 230239

If you weld aluminum, you know the struggle of wire feeding. It’s like trying to push a wet noodle through a straw. The moment there is any friction, the wire buckles, shavings build up, and you end up with a birdnest at the drive rolls or an unstable arc that ruins your bead. The Miller 230239 FasTip Liner is your defense against these headaches. This is the "jump liner" that sits inside the neck of your XR-Aluma-Pro gun, specifically designed for the 4-inch head tube setup. It bridges the gap between the main gun cable and the contact tip.

Why is this little piece of plastic so important? Because it's made of Teflon. Unlike steel liners that can scratch and grab soft aluminum wire, this Teflon liner is slick. It allows 3/64" and 1/16" wire to glide through the bend of the gun neck with almost zero resistance. This means your push-pull system doesn't have to fight to deliver wire to the puddle. The result is a consistent wire speed, a stable arc, and beautiful, clean welds. When you are in the middle of a critical job, the last thing you want to do is stop to clear out aluminum shavings from your gun neck.

Replacing this liner is part of the FasTip system, meaning it's designed to be quick and painless. You don't need to take the whole gun apart. If you start noticing your wire chattering or your arc sputtering, checking this neck liner should be one of your first troubleshooting steps. Over time, heat and the constant friction of the wire will wear it down. Swapping it out with a fresh Miller 230239 restores that factory-smooth feeding performance immediately.

Don't settle for generic liners that might not fit perfectly or require trimming. This genuine Miller part is pre-cut to the exact length for 4-inch assemblies. It seats perfectly against the back of the gas diffuser and the front of the gun body, ensuring there are no gaps where the wire could snag. Keep a few of these in your toolbox so you are never stuck waiting on parts when you should be burning wire.