This TIG torch handle is compatible with 17, 24, 9, A-125, A-150, A-80, HW-17, HW-24, HW-9, PTA-17, PTA-9, 17, 17F, 17FV, 17FVB, 17HP, 17HPV, 17V, 24, 24HP, 24V, 9, 9F, 9FVB, 9HP, 9P, 9V, 9VB, HW-17, HW-17F, HW-17R, HW-24, HW-9, HW-9F, HW-9R, PTA-17, PTA-17 and more under the Linde brand. It can be used for TIG welding.