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Description: - Materials: Copper - Length: Approx. 17mm/ 0.67inch, Bottom Diameter: Approx. 8mm/ 0.3 inch Usage: Weigh unused full butane canister and write with felt-tip on the base. - Place empty canister to be refilled in freezer for approx. half hour or overnight. - Remove canister from freezer and place adapter onto the canister. - Take your new full butane canister and insert into adapter. - Push canister firmly down for 10-15 seconds at a time, checking each time the weight of the canister until it matches the first weight written on the base. Package Includes: 2 Pieces Gas Canister Refill Adapter