Mathey Dearman Double Seal Purge System 90-101mm - DS90-101 5000 CFM 045 is an excellent choice

045 is an excellent choice for welding on metals with a medium to high presence of millscale

Harris Model 5090-3 Welding/Brazing Tip - 1601730

self reseating

consult Lincoln Electric's drive roll compatibility chart in the owner's manual

nozzle compatibility:

Mathey Dearman Double Seal Purge System 90-101mm - DS90-101 5000 CFM 045 is an excellent choiceMathey Dearman Double Seal Purge System 90 101mm DS90 101 The Mathey Dearman Double Seal Purge System 90 101mm DS90 101 is designed for effective purging in medium to large diameter pipeline welding applications. This purge system fits pipe diameters from 90mm to 101mm and features a double seal design that ensures an inert atmosphere inside the pipe. The high temperature silicone disks create an airtight seal, reducing inert gas use and purging time,