Thanks for the responses so I live in the Chicago land area an seems I called almost every gas supplier around here. And what I found out is that the cylinder had a new neck ring put on by a past owner of the tank sometime which is evident by the miss aligned dimples on the neck and must have painte...

Hi guy I'm new to welding and so far I have found the hardest part is finding affordable cylinders and refills so I have been using facebook market place and I was able to buy a 330cf cylinder for $180 filled from a gentlemen. It had a smooth neck and but I did find what could be a name stamped in t...