13401100 - Tweco 34A Slip-On Nozzle Insulator for No. 4 MIG Guns (25-Pack)

Keep Your Tweco No. 4 Running Smoothly

Every welder knows that the front end of the MIG gun takes the most abuse. Heat, spatter, and constant movement wear down your consumables, and the nozzle insulator is often the unsung hero holding it all together. The Tweco 34A Nozzle Insulator is the genuine replacement part for your trusty Tweco Classic No. 4 MIG gun. If you are running a 400-amp setup, you need an insulator that can handle the heat without crumbling or losing its grip. This 25-pack ensures you have plenty of spares in your toolbox or supply cabinet, so you never have to stop a job because of a worn-out plastic ring.

The 34A insulator features a simple but effective slip-on design. It slides over your gas diffuser and provides the friction needed to hold your slip-on nozzle securely in place. Over time, old insulators can get brittle from the heat or clogged with spatter, causing your nozzle to wobble or fall off—or worse, allowing the nozzle to touch the contact tip and short out against your workpiece. Swapping in a fresh 34A insulator restores that tight, reliable fit, ensuring your gas coverage stays centered and your nozzle stays electrically isolated.

Designed for the professional welder, these insulators are built to the exact specs of the Tweco Classic series. They aren't generic knock-offs that might fit loosely or melt prematurely. When you are welding at 300 or 400 amps, you want confidence that your gun is going to perform. The 34A handles the thermal stress of heavy fabrication, structural steel work, and manufacturing production lines. It’s a small part, but it makes a big difference in the daily operation of your torch.

Maintenance is quick and easy. When you pull your nozzle to clean out spatter or change a tip, take a second to check the insulator. If it looks charred, cracked, or the nozzle feels loose, pop the old one off and slide a new 34A on. It takes seconds but saves you from the frustration of arc-outs and poor gas coverage. With this bulk pack, you can afford to keep your equipment in top shape, ensuring every bead you lay down is as good as the last.