Profax 14-45 (PX14-45) .045” Tweco Style MIG Contact Tip, Threaded, 0.054” Tip BoreProfax 14 45 PX14 45 is a Tweco style threaded MIG contact tip for . 045 wire. Its used with Profax 250 400 amp guns and also fits Tweco #2, #3, and #4 style MIG guns. Specifications Brand: Profax MPN: 14 45 (Mfr ref: PX14 45) Wire size: . 045 max wire OD Connection type: Threaded Overall length: 1 1 2 Tip size (bore): 0. 054 Fits: Profax 250 400 amp guns; Tweco #2 #3 #4 guns