10401087 - Tweco MS415M Spray Master 450A MIG Gun for Miller Feeders

Heavy-Duty Air-Cooled Performance

The ESAB Tweco Spray Master MS415M (Part Number 10401087) is a premier 450-amp air-cooled MIG gun designed for heavy industrial fabrication. Engineered to bridge the gap between standard air-cooled guns and complex water-cooled systems, the Spray Master series allows welders to operate at higher amperages for longer periods without the bulk or maintenance of a water cooler. This specific model features a 15-foot (4.6-meter) cable assembly, providing ample reach for working around large assemblies, structural steel, or within manufacturing cells.

Seamless Miller Compatibility

Designed with a direct Miller-style rear connection, the MS415M plugs instantly into most Miller wire feeders and power sources that utilize the standard Miller pin configuration. This "plug-and-play" capability ensures that shops running Miller equipment can easily upgrade to the durability and performance of Tweco's Spray Master line without requiring adapters or modification kits. The rear connection is robustly built to ensure consistent conductivity and gas flow, minimizing voltage drop and porosity issues.

Robust Construction & Consumables

The Spray Master 450 is built to withstand the harshest environments. It features a heavy-duty contact tip and diffuser system that improves arc stability and heat dissipation. The gun utilizes standard Tweco consumables—including the widely available 11, 14, and 16 series contact tips—making inventory management simple for procurement teams. The conductor tube is protected by a metal jacket, and the handle is constructed from high-impact, heat-resistant composite materials. With an 80% duty cycle at 450 amps using CO2, this gun is a workhorse for flux-cored and solid wire applications alike.

Maintenance Friendly

One of the key advantages of the Tweco Spray Master series is its serviceability. The gun is designed to be field-repairable, allowing maintenance personnel to quickly replace liners, trigger switches, or conductor tubes right on the shop floor. This design philosophy reduces downtime and extends the total lifecycle of the asset, providing a superior return on investment compared to disposable or non-serviceable MIG guns.