Everything OK, works

Missing instruction but found some other brands with videos online. Be careful not to overfill the receiving canister.
The other product has a venting button to vent the overfilled canister that this does not have.

Good trade

too tight on the thread. Makes it hard to seal. Works well when you do manage to fit all the way.

I have bought this item for the situation where I may have a need to refill a small camping gas canister. this is yet to happen so not tested