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Most auto part store guys could care less what your doing. Heck I call it a win if I get the right part on the 1st trip.

If asked, just tell them you have always wanted to learn how to weld, and your buddy said he'd teach you if you'd buy some of the supplies. I doubt they'd question further.

@Mjedwards409, yes, this regulator will work on a weld ox cylinder (CGA-540 fittings). Unsure of the designation of welding vs medical cylinders.....my rig is approximately 9" diameter and 48" tall. When I still lived in Texas I had a weld ox supplier who leased tanks with a $50 deposit and $6/mo fee...refills/exchange were $18. When I moved to Oklahoma several years ago I was unable to find a supplier who leased so had to buy the cylinder for $300 and exchanges are $23. Just make sure not to let the supplier know that you intend to breathe it!! DD