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The XTRWELD 42-4045-25 is a MIG gun conduit liner designed to guide welding wire smoothly from the drive roll to the contact tip inside a MIG welding gun. Built in a Tweco style configuration, this liner accommodates wire diameters from 0.040 inches to 0.045 inches and measures 25 feet in length. It fits Tweco style MIG guns rated at 180 to 250 amps. Welding technicians and fabricators install this liner to maintain consistent wire feed, reduce friction-related birdnesting, and extend gun life. The liner ships as a single unit and weighs 1.24 pounds.
This liner is suited for MIG welding applications in fabrication shops, maintenance and repair operations, and light industrial settings where Tweco style guns are standard equipment. It is a direct-style replacement for worn or damaged liners in 180 to 250 amp Tweco style guns. Proper liner selection by wire diameter and gun length is critical for reliable wire feed performance, making this a stock item for shops running 0.040 or 0.045 inch wire.
Designed for use with Tweco style MIG guns rated 180 to 250 amps, accommodating wire sizes of 0.040 inches to 0.045 inches.
Liner replacement is typically performed by a welding equipment technician or an experienced MIG gun operator. Before servicing, disconnect the MIG gun from the wire feeder and ensure the welder power is off. Feed the liner from the gun-end connector through the cable conduit, then trim to length as needed per the gun manufacturer's procedure. Avoid kinking the liner during installation, as bends will cause wire feed resistance and premature wear.
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