Originally Posted by Pickle
I need the actual DOT rule about the 2x2 tanks. My local fill guy gave me some serious grief about this. I'd like to show up with said rule in hand.
So far this is what I've been able to find (PDF) ... Code of Federal Regulations Title 49 ss 180.207
Look under Table 1 (top of page 2).
I'm a little confused at why an exemption needs to be in place for the cylinders for the "2x2" rule to apply if indeed that's the case. However for what it's worth here is a list that I found of exemptions ... DOT Exemptions
I've noticed that some now say "DOT-SP" instead of "DOT-E". At least for my old tank it's just a change in the way it's labeled now and doesn't change anything else.