o/a porta torch tanks

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Hello,I have one of those porta torch oxy/acet. rigs. I am wanting to use a larger size acet. tank (30 cf vs. 7 cf) but the porta torch acetylene regulator fitting is too small to attach to the larger bottle's valve. Is there a way to adapt the acet. regulator fitting to this larger size (proper gas fittings of course), or do I have to buy a whole new full size regulator/hose and torch kit?Thanks,Dean
Reply:The fitting that attaches the regulator to the tank threads in to the regulator.  These are replaceable.  Look up your regulator manufacturer, you want to get a replacement fitting that is compatible with CGA510.  I believe your current fittings are CGA300.
Reply:Like 76GMC1500 said, you can replace the fittings in the regulators or just go to your near welding supply, they should have a huge assortment of adapters that would allow you to connect your regulator's up to any size tank's. Worst case go online and look for CGA connectors/adaptors. I started to buy on eof those but opted to go ahead for the big set instead. I also screwed up because I got a Q OXY tank which is fine, but I decided to go with a B Acetylene, so after cutting for a while or welding for a a few hours it's back to the welding supply for a exchange on the Acetylene. Go bigger if you can afford it, that is if you're going to use it often.
Reply:awesome, thats what I wanted to know, that I could use my current port a torch regulator and safely use adaptors.  Thanks!