300491 - Miller Plasma Air Filter and Dryer Kit 300491

High-Efficiency Air Filtration for Plasma Systems

The Miller RTI Filter/Air Dryer Kit (300491) is a critical accessory designed to enhance the performance and longevity of plasma cutting systems. In plasma cutting, the quality of the air supply is paramount; moisture, oil, and dirt can rapidly degrade consumables, cause erratic arcs, and lead to poor cut quality. This filtration system addresses these issues by removing water, dirt, and oil particles as small as one micron with an impressive 99.9% efficiency. By ensuring that only clean, dry air reaches the torch, operators can experience more consistent arc starting, longer electrode and nozzle life, and cleaner cuts with less dross.

Robust Construction and Design

Engineered for industrial environments, the filter features a heavy-duty metal bowl that provides superior durability compared to standard plastic housings. A see-through poly window is integrated into the bowl, allowing operators to visually inspect the filter's condition and monitor fluid levels at a glance. The unit is equipped with an automatic drain mechanism, which automatically expels accumulated liquid, reducing the maintenance burden on the operator and preventing liquid carryover into the torch line. When maintenance is required, the easy spin-off design of the filter element makes replacement quick and tool-free.

Versatile Installation

The kit is designed for flexibility and ease of installation. It includes a universal mounting bracket that allows the unit to be securely attached to the back of most Miller plasma cutters, such as the Spectrum 875 and Spectrum 375 models, or mounted directly to a wall or workstation. The package comes complete with a 12-inch air hose with fittings, as well as all necessary mounting hardware and connectors. With a standard 1/4-inch NPT port and a maximum flow rating of 20 SCFM at 80 PSI, this filter/dryer is compatible with a broad range of plasma systems, making it a versatile solution for shops of all sizes.