Adapter Kit for Refilling W21.8 to CO2 Tank with Quick Connect Functionality

How it works: To use the product correctly, follow these instructions: 1. Cool the soda machine cylinder in the freezer for 1 hour. 2. Attach the CGA320/W21.8 connector to a commercial CO2 gas cylinder. 3. Disconnect the quick connector of the black adapter, then securely tighten the black adapter to the CO2 cylinder. Ensure the knob on top of the black adapter is in the highest position. Do not turn the adapter knob down to open the CO2 cylinder. Pressing the 6mm wide valve pin will close the valve and prevent CO2 from entering. 4. Reconnect the quick connector. 5. For most large cylinders, turn the cylinder upside down or lay it horizontally. Some tanks do not have a dip tube (syphon tube) inside. 6. Carefully open the valve of the large gas cylinder. The valve may close the flow if opened too far or too quickly. Open the valve slowly until you hear gas flowing. 7. After approximately 15–20 seconds, the cylinder will be fully filled. 8. Close the valve on the large gas cylinder. 9. Open the bleed screw to release any residual gas. 10. Unscrew and remove the CO2 cartridge. Important notes: 1. If liquid CO2 is present, invert the CO2 tank if refilling fails while upright, as some tanks lack an internal dip tube (syphon tube). 2. The cylinder should be empty before use. Pre-cooled cartridges will fill more effectively. 3. Open the tank valve very slowly when filling to avoid activating the 6mm wide safety valve pin on the soda machine bottle. 4. This adapter is not compatible with RPV (residual pressure valve) systems. Refer to the provided image for identification. Some RPV valves can be removed using a hex wrench—verify your tank type before ordering. If your tank has an RPV valve, consider selecting the RPV push adapter option at purchase.