Usage: 1. Weigh the unused butane canister and write on the base with a marker. 2. Place the empty canister for about half an hour or overnight. 3. Remove the canister from the freezer and place the adapter on the canister. Take your new, full butane canister and insert it into the adapter. 5. Press firmly on the bottom for 10 to 15 seconds and check the weight of the canister each time until it is equivalent to the original weight indicated on the base. It weighs only 5g, so you can easily carry it when hiking and camping. With this adapter, you can refill your gas canister as if you were using a cigarette lighter. You save a lot of money when refilling the product. Warning: Once you have refilled the canister, it is always advisable to check the canister seal to avoid leaks. Only refill your canister in a well-ventilated area, outdoors! Please note: without gas tank. Function: 1. Material: Copper. 2. Weight: 0.0088 kg. Contents: 3 gas refill adapters. Lightweight: It weighs only 5