Usage: 1. Weigh the unused butane canister and write on the base with a marker. 2. Place the empty canister in the freezer for about half an hour or overnight. 3. Take the canister out of the freezer and place the adapter on the canister. 4. Take your new full butane canister and insert it into the adapter. 5. Press firmly on the bottom for 10-15 seconds and each time check the weight of the canister until it equals the original weight indicated on the base. It weighs only 5 g, allowing you to easily carry it when hiking and camping. With this adapter, you can fill your gas can as if you were using a cigarette lighter. You save money when you refill the product. Warning: Once you have filled the canister, always check the seal to prevent leaks. Only fill your canister in a well-ventilated area, outdoors. Function: 1. Material: Copper 2. Weight: 0.0088 kg Contents: 3 gas refill adapters Lightweight: it weighs only 5 g, so you can easily carry it while hiking and camping. Scope of delivery: 3 gas refill adapters