Gas tank filling: Inflation should be performed from top to bottom, moving from high pressure to low pressure. It is recommended to chill the gas tank in a refrigerator for 30 minutes before inflation. Warning: Operation must only be conducted by qualified personnel and in compliance with applicable national safety standards. Inflation of MAPP gas or liquefied petroleum gas into flat gas tanks or cassette gas tanks is strictly prohibited. Inflation must be carried out in a well-ventilated outdoor area. During inflation, non-gaseous components may accumulate at the upper part of the tank and can be released using the pressure release button (press for approximately 2 seconds prior to inflation). Note: The air valve must be closed when releasing pressure, and the device must be installed in the correct orientation. This valve allows gas from multiple flat gas tanks to be consolidated into a single tank for reuse. The valve is compatible with cassette converters and other standard converters, enabling gas transfer between tanks. Connection can be made in any orientation. The switch mechanism features 58 copper construction for durability. The gas seal utilizes fluoroplastic O-rings resistant to wear, chemicals, and extreme temperatures, ensuring reliable performance within a range of -20°C to 250°C. Dual O-ring sealing system provides primary and secondary sealing to prevent leaks. Only connect tanks containing the same type of gas. Never mix different gases. Residual gas collection tanks should not be filled to full capacity. Similarly, newly purchased gas tanks are not intended to be filled to 100% capacity. Recommended method: Chill both the source tank and receiving tank in a refrigerator for 20 minutes without releasing pressure, then proceed immediately with gas transfer.