Features Suitable for Low Temperature: This adapter can be used repeatedly in freezing temperatures, providing convenience and reliability even in cold environments. Excellent Filter Element: Utilizes an improved filter material to eliminate the taste and smell of carbonated water, ensuring a superior beverage experience. Brass Material: Constructed with high-strength and pliable brass for long service life, withstanding both cold and hot pressure conditions. Good ing Performance: Ensures airtight connection to the cylinder, delivering peace of mind and precision during usage. Wide Range of Application: Connects the cylinder to any large CO2 tank, suitable for large gas tanks with or without residual pressure valve, providing versatility and flexibility. Specification: Item Type: CO2 Cylinder Refill Adapter Material: Brass Connector: CGA320 to TR21 4 Package List: 1 x CO2 Cylinder Refill Adapter 1 x Hex Wrench 6 x Big Washer 9 x Small Washer 1 x Plug 1 x Instruction Note: This adapter is not suitable for old cylinders (with pin type cylinder valves) Package List 1 x CO2 Cylinder Refill Adapter 1 x Hex Wrench 6 x Big Washer 9 x Small Washer 1 x Plug 1 x Instruction