thxs Scotty001
i dont know anyone who dives, i was thinking it would come in some sort of cylinder but iv looked every were on the net to see if i can find one for filling the bags but with no luck and i dont know what consistancy the oxgen has to be for shiping fish
One option if our after a cylinder is
HERE HEREor google scuba diveing / scuba cylinders etc etc, or scuba diving training in your area as they are also bound to have a shop too which sells the cylinders as well as maintain and saftey cert them too.
Remember needs to be O2 cleaned as well before oxygen can go in if buying new then some places will o2 clean it for free (Normally £20)
,if you can tell me where in the uk you are i can see if i can find a filling station or cert statin for you