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I thought I would share that I got my 20 lb CO2 tank filled today at my local Capweld chain store. It cost $15.86 out the door. The guy said they actually buy all medical grade because once they bought another grade and it smelled a bit sulfurous because the purification wasn't good enough...

It seems like people never remove their HLT herms coil and that there is little reason to remove it for cleaning. I was thinking of just using a step bit to drill and then dimpling the hole and silver soldering the stainless coil sticking right through the sides of the tun to do away with...