I have an extra set of tanks I no longer need, have owned them since new. Oxygen cleaned, never had any issues with rust inside, etc. The visuals went out in March, I will gladly have them re inspected if the buyer desires, up for hydros in October but I?ll guarantee pass or I will take the tanks back and refund the money. They have a standard valve on one and a left handed thermo on the other as I used them for sidemount. Asking $450 for the pair, I?m located in seminole, fl. Willing to drive a reasonable distance to deliver or I?m up in cave country every few weeks.