1Soda valve, adopts highquality brass material, has good durability and stability. 2With gasket, good sealing performance, no air leakage when connected with the cylinder. 3Practical soda carbon dioxide filling accessories, easy to install and reliable to use. 4With a release switch, easy to operate, high pressure resistance, and strong practicability. 5Exquisite workman, excellent performance, easy to fill carbon dioxide gas. Item Type: CO2 Refill Adapter Material: Brass Weight: Approx. 360g / 12.7oz Thread Size: CGA320 / TR21-4 Thread Interface: Large CO2 Gas, CGA320 Applicable Countries: United States, Canada, Brazil, Colombia, Philippines Instruction: 1. Connect the refill adapter to the large CO2 cylinder equipped with siphon firmly using an adjustable wrench. 2. Remove all residual gas from the cylinder to be refilled. 3. Freeze the empty cylinder in the refrigerator (recommended freezing for at least 3 hours). 4. Measure the weight of the cooled empty cylinder on the scale. 5. Connect the adapter to the siphon-equipped CO2 tank. 6. Open the CO2 tank valve slightly and charge the empty cylinder for 7 to 10 seconds. Can hear the incoming CO2 gas sound. 7. Remove weight from adapter and measure weight. If the empty cylinder weight is subtracted from the measured weight, it is the charge amount. 1 x Soda Valve 3 x Gasket