From Newsgroup: sci.engr.joining.welding

This is an old thread I know. I the first number is the orifice size as stated. The bigger the number, the bigger the hole. Second number is the series of torch it fits, 3 being the medium duty, 1 being heavy duty. Don't know what 5 is but perhaps light duty. The last 3 digit number is fuel type, 101 is acetylene, 303 is natural gas and propane. I've also seen GPN instead of 303.
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