How to use it: 1. You need an inflatable valve, an empty flat gas container, a liquefied gas cylinder, and an electronic scale. 2. Please make sure the flat gas container connection valve is closed before gas charging. 3. Connect the liquefied gas cylinder interface to the cylinder, unscrew the cylinder valve, and check for any gas leakage. 4. Place the liquefied gas cylinder horizontally or upside down, then connect it to the flat gas container. Place the connected flat gas container on the scale and open the liquefied gas cylinder valve. You will see liquefied gas flowing through the pipe. 5. After gas charging, close all valves. This propane refill adapter is designed to safely and easily refill your flat gas container from a liquefied gas cylinder. With this adapter, you can refill your flat gas tank. The gas container is not included. Color: As shown Material: Metal Package Contents: 1 x metal tube 1 x adapter Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.