It is designed to fit AHP TIG unit with 22K Ω and 25K Ω pedals. High quality rack and pinion design combined with patented technology delivers ones of the best operating pedals on the market. . Excellent choice for replacement or upgrading on applicable units. This pedal will fit AHP TIG/Stick Pedal capable units, as well as older units that required a 22K potentiometer. Not designed to replace or fit units with amp control knob on pedal, or units that do not limit maximum amps on panel while foot pedal is in use.