Premium slide-over gas nozzle 24AH-series (heavy duty) and 24AT (tapered) for use with Lincoln 300-450 and Tweco #3/#4 MIG welding guns. For use with Tweco Professional #3/#4 medium-to-heavy duty MIG welding gun; also compatible with gas nozzles KP1932, KP24AH and KP24AT in Lincoln 300-450 MIG welding gun up to 450-amp. Available nozzle orifices: 3/8", 1/2", 5/8" and 3/4". Slides over nozzle insulator 34A to obtain desired tip-nozzle relationship. Heavy duty 24AH nozzle has longer working life compared to standard 24A nozzles. 24AT nozzles are with tapered nozzle body. Refer to your MIG welding gun user manual for selection of correct gas nozzle. Package of 2-pk and 5-pk. U.S. based welding and hardware supplier. Premium slide-over gas nozzle 24AH-series (heavy duty) and 24AT (tapered) for use with Lincoln 300-450 and Tweco #3/#4 MIG welding guns. For use with Tweco Professional #3/#4 medium-to-heavy duty MIG welding gun; also compatible with gas nozzles KP1932, KP24AH and KP24AT in Lincoln 300-450 MIG welding gun up to 450-amp. Available nozzle orifices: 3/8", 1/2", 5/8" and 3/4". Slides over nozzle insulator 34A to obtain desired tip-nozzle relationship. Heavy duty 24AH nozzle has longer working life compared to standard 24A nozzles. 24AT nozzles are with tapered nozzle body.