Main Features: Filling butane canister adapter for hiking camping stove The gas refill adapter comes with spare o-rings for installed inside the copper pipe Made by premium copper material, which is durable for long time use Small size and lightweight,you can carry it very convenient With gas adapter, you could refill your gas canister in a convenient way, which will save money by refilling. 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 original weight written on the base Warning : Considering safety, the refill canister weight should lighter than the original canister! After you have refilled the canister it is always good safety practice to check the seal on the canister for no leaks! Only refill your canisters in a well ventilated area, i.e. outdoors! Specification: Material:copper Size: 11x10mm/0.43x0.39 Top Diameter: 3mm/0.12 Bottom Diameter: 8mm/0.31 Note: Please allow 0.5-2cm differences due to manual measurement Due to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you! Package Included: 1 * Gas Canister Refill Adapter