Note: The interfaces at both ends correspond to different gas cylinders. Gas tank filling: Inflating is generally done from top to bottom, from high pressure to low pressure. It is recommended to freeze the inflated tank in the refrigerator for 30 minutes before inflating. Warning: It is forbidden to operate by non-professionals, and it must be carried out under the relevant national safety standards. It is strictly forbidden to inflate MAPP gas or liquefied petroleum gas into flat gas tanks or cassette gas tanks, and it must be carried out outdoors during the inflation process. Pressure release button During the inflation process, the non-gaseous gas in the tank be squeezed on the upper part of the gas tank, and can be discharged through the pressure release button ( for about 2 seconds before inflating). Note: When releasing pressure, the air valve must be closed, and the device of this product is installed forward. The gas in multiple unused flat gas tanks can be collected into one gas tank through this valve to achieve the purpose of reuse. This valve can be used with cassette converters, Mamp converters, converters, etc. to achieve mutual inflation between gas tanks, regardless of the upper and lower directions, and can be connected arbitrarily. The core part of the switch uses 58 copper, which is to wear and tear. The gas seal uses fluoroplastic O-rings, which are to wear, chemical , low temperature and high temperature, and can be used normally at -20-250 . Double O-ring design for sealing, one to seal air and one to prevent air leakage. The gas cylinders can be different, but different and different gases should not with each other. Color: Grey & Red Material: Aluminum Alloy + Copper Specifications:A Package Contents: 1 x Converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.