How to use: 1. Weigh the unused butane can and label the bottom with a marker. 2. Set the empty can down for about half an hour or overnight. 3. Take the canister out of the freezer and put the adapter on the canister. Take your new, full butane canister and put it in the adapter. 5. Press firmly on the ground for 10-15 seconds, checking the weight of the can each time until it matches the original weight marked on the ground. It weighs only 5g, so you can easily carry it when hiking and camping. With this adapter you can fill your petrol can like you would with a cigarette lighter. You will save a lot of money when refilling the product. Attention: Once you have filled the can, it is always advisable to check the tightness of the canister to avoid leaks. Only fill your canister in a well-ventilated area, outdoors! Please note: without gas tank. Feature: 1. Material: copper. 2. Weight: 0.0088 kg. Contents: 3 gas refill adapters. Lightweight: It weighs only 5 g, so you can easily carry