8-4015 - Tweco 4A-90 Conductor Tube 90 Degree Torch Head

Restore Your MIG Gun's Performance

Is your MIG gun sputtering, feeding poorly, or getting dangerously hot at the neck? It might be time to replace the conductor tube. The Tweco 4A-90 (Part #8-4015) is the standard 90-degree replacement neck for the legendary Tweco Spray Master 450 and No. 4 MIG guns. This is the "swan neck" or "goose neck" that takes the brunt of the heat and abuse during daily welding operations.

Built for the Grind: Welding isn't gentle, and neither is this part. Built with a heavy copper core, it handles high amperage (up to 450 amps) without overheating, keeping your arc smooth and consistent. The 90-degree angle is the industry standard for most flat and horizontal welding, giving you the right torch angle without straining your wrist. The durable insulation on the outside protects the tube from shorting out against your workpiece, a common issue with cheaper aftermarket replacements.

Easy Swap: Downtime kills productivity. This conductor tube is designed for a quick swap. Simply loosen the set screw on your handle, pull out the old neck, and slide this one in. It fits perfectly with your existing Tweco diffusers, nozzles, and liners. Don't let a bent or clogged neck ruin your welds—keep a spare 4A-90 in your toolbox to keep the sparks flying and the beads laying flat.