Do you know if something like this would work? https://www.amazon.com/Cylinder-Converter-W21-8-14-Connector-Accessories/dp/B0B3J5HK76 It looks like the right adapter, but doesn't have a pin valve on the top (so that means that the drinkmate canister valve is wide open when this adapter screws on, and care will have to be taken to make sure it disconnects before the adapter is removed from the refill tank?).