14001143 - Tweco 45-40-15 Steel MIG Liner for .040-.045 Wire, 15ft

Keep Your Arc Smooth with the Tweco 45-40-15 Liner

Every welder knows the feeling: you're in the middle of a long bead, and suddenly the wire starts stuttering. You check your ground, you check your settings, but the problem persists. More often than not, the culprit is a dirty or kinked liner. The Tweco 1400-1143 (45-40-15) is the go-to replacement conduit for welders running .045" wire in standard Tweco setups. Don't let a cheap or worn-out liner ruin your welds or burn up your contact tips—swap it out with this genuine Tweco part to get back to that smooth, frying-bacon sound you want.

Built tough for the shop floor, this liner is made from high-grade spring steel. It's designed to handle the abuse of daily welding, resisting kinking even when you're working in tight positions with the cable looped. The 15-foot length covers you for the most common gun sizes, and if you're running a shorter whip, you just measure, mark, and snip it to size. It's specifically calibrated for .040" to .045" wires, providing just enough clearance for the wire to slide freely without slop, which is critical for accurate aim and consistent electrical contact at the tip.

This liner fits the workhorses of the industry: the Tweco #4 and #5 guns, as well as the Spray Master series. If you are pushing flux-core or solid steel wire, this is the liner you need in your maintenance kit. Pro tip: when you change your liner, lay your gun cable out completely straight on the floor to ensure you cut the new liner to the exact correct length—too short and you'll lose gas coverage; too long and you'll have feed issues. Keep a spare 45-40-15 in your toolbox so you're never stuck waiting on parts when a deadline is looming.