#just use them till empty then when you refill they will swap at no extra charge for the larger bottle (just the gas) or go to the local council tip and they normally have loads of empty gas bottles and only too happy to let you take them away.
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Not with these Zip as they are refillable bottles that stay in the van .
John.
Hi do you want to sell your 6kg bottles? We have just bought a used van and would like to fit some.