PlasmaDyn© Replacement Parts Replacement MIG Gun Switch/Button Used on Many MIG Guns - including Tregaskiss, Miller, Bernard, Lincoln, Hobart Includes: Mig Torch Button/Switch - Tregaskiss Part Number 411-1 Tregaskiss / Bernard T Style Handles Trigger switch, single position barrel style switch is normally open. Compatible withMany MIG Guns including: Tregaskiss style TR300, TR400 & TR500 Bernard T style 350, 450 & 550 below is an Example of the common torch switch this bottun is used in NOTE: you must verify this part fits YOUR torch -