D-MA250M - Miller AccuLock S Gas Diffuser for MDX-250 (2-Pack)

Upgrade Your MDX-250 with AccuLock S Technology

If you are welding with a Miller MDX-250 MIG gun, the AccuLock S Diffuser (D-MA250M) is the essential upgrade you need to keep your arc smooth and your frustration levels low. We all know that the number one enemy of a productive day in the shop is a wire feed issue. Bird-nesting at the drive rolls or burnbacks at the tip can stop a project in its tracks. Miller designed the AccuLock S system specifically to solve these problems by rethinking how the liner and tip connect. This 2-pack of diffusers ensures you have the spares you need to keep running without interruption.

Why makes this diffuser different?
It’s all about alignment. In many standard MIG guns, there is a small gap or misalignment between where the liner ends and the contact tip begins. This is where the wire can shave, drag, or snag. The D-MA250M AccuLock S Diffuser is designed to center the contact tip perfectly with the liner lock as you tighten it. This creates a "flawless wire-feed path" that virtually eliminates the drag that causes erratic arcs. When your wire feeds smoothly, your puddles are more consistent, and your welds look better.

Built for Heat and Speed
Welding generates intense heat, and heat kills consumables. This diffuser features a unique "Cooling Tail" design. The tail of the contact tip sits inside the diffuser where the shielding gas flows, actively cooling the tip while you weld. This means your tips stay harder and last longer, saving you money in the long run. Additionally, the tapered connection locks the tip and diffuser together tightly for maximum electrical flow, ensuring you get all the power to the arc that you set on the machine.

Quick Changes on the Fly
Nobody likes fumbling with fine threads when wearing welding gloves. The D-MA250M uses coarse threads that resist cross-threading and allow for rapid replacement. Whether you are swapping out a worn diffuser or changing wire sizes, the process is fast and error-free. Compatible exclusively with the MDX-250 MIG guns, this diffuser is a key part of the AccuLock ecosystem that helps you weld smarter, not harder.