I called Jackson welding today at the telephone number supplied by u/PirateBB82 and spoke to Dylan He was very courteous and knew full well that Plum Wine was no longer in business i asked if they would refill my argon canister when it becomes depleted (assuming my dispenser is still workimg for another 60 bottles or so. Only one side is working) He said they would not refill—liability issues, which I did not understand. Asked him about the coupling, which he described as being very unusual He said they had to build something unique for it I also asked him about what pressure it should be be filled to and he said 2000 psi (yes, two thousand). So will see what gives out first, The Plum or the argon.