[coolair]

I purchased an empty small bottle from Northern and had it filled it up @ a local welding supply co - no questions asked - the only bummer was they took my new bottle and just swapped it out for an old one and I just paid for gas. I don't weld a lot but like scott said, I always ran out on Sat afternoon in the middle of a project - So, I purchased a second small bottle @ Northern and rotate them so I always have a spare full bottle waiting in case I run out.