4623RM - Miller AccuLock MDX-250 Nozzle Insulator Cap (Pack of 2)

Genuine Miller 4623RM Insulator for MDX-250 MIG Guns

Keep your Miller MDX-250 MIG gun running at peak performance with the genuine Miller 4623RM AccuLock Nozzle Insulator. This essential replacement part is the unsung hero of your welding torch, sitting between the gas diffuser and the nozzle to ensure everything operates safely and smoothly. If you have noticed erratic arcs or are worried about your nozzle shorting out against the workpiece, a fresh insulator is often the solution. These insulators are sold in a convenient pack of two, so you can keep a spare in your toolbox and avoid downtime in the middle of a project.

The 4623RM is not just a piece of rubber; it is a core part of Miller's AccuLock system. It is designed to perfectly fit the MDX-250 and MDX-250 EZ-Select guns found on popular machines like the Multimatic 255 and Millermatic 255. When installed, this insulator helps center the liner within the gun neck. This alignment is crucial for preventing wire feeding issues like bird-nesting or stuttering, which can ruin a good weld bead. Whether you are using the standard AccuLock MDX consumables or the heavy-duty AccuLock S series, this insulator cap is the correct fitment for your setup.

Installation is quick and easy, requiring no special tools. Simply remove the nozzle, replace the worn insulator on the diffuser, and reassemble. Regular inspection of your insulator is recommended; if it looks charred, cracked, or brittle, it is time to swap it out to maintain proper gas coverage and electrical safety. Trust genuine Miller parts to maintain the warranty and performance standards of your equipment.

Why Choose Genuine Miller Parts?

• Perfect Fit: Guaranteed compatibility with your MDX-250 handle and neck.
• Improved Feeding: Helps align the wire path for less friction and better arc stability.
• Value Pack: Includes two insulators per order, giving you better value and readiness.