I recently purchased two CO2 tanks, and over $1000.00 in supplies. Upon bringing the CO2 for exchange they gave me a hard luck story about the "CO2 guy" having a heart attack, and that I would have to get the tanks exchanged elsewhere. So, I had them exchanged at Praxair. Today I took one of the Praxair tanks back to Long Beach Hydro for exchange, and they told me that the "CO2 guy" wouldn't take the praxair tank unless they charged ME an extra $35 dollars for pressure testing. I told them that I wasn't happy, but they really didn't care. So, I will take my business someplace else.