Material: Aluminum alloy, Copper Color: Gold; Lilac Silver Topic: TR21-4 Function: Connects CO2 cylinders with TR21-4 thread to DUO, TERRA, and ART soda machines with quick connection system Features: - Compatible with common CO2 cylinders featuring standard trapezoidal TR21-4 thread, supporting bottles up to 60 liters and 425g CO2 content - Constructed from durable, lightweight aluminum alloy for reliable performance - Environmentally friendly, robust, corrosion-resistant, and long-lasting - Designed to fit securely on 425g CO2 cylinders, including models from various brands such as Crystal 2.0, Penguin, Cool, and Aqvia - Includes flat seal for secure attachment to TR21-4 valve Instructions: 1. To install on Terra Water Sprinkler, remove the pink component by pressing the pins as indicated in the instructions and pulling downward. For compatibility with DUO and ART models, minor modification may be required in the cylinder compartment to allow proper insertion. 2. Screw the quick adapter firmly onto the TR21-4 valve using the included flat seal. Ensure the adapter threads properly onto the cylinder valve. If the adapter does not screw in, the cylinder is not compatible. 3. Insert the 425g CO2 cylinder into your Soda DUO, Art, or Terra machine. Secure it by lowering the quick-release mechanism and pressing until it clicks into place. Ensure the hexagonal safety valve on the TR21-4 regulator faces outward, not sideways or inward toward the housing. Why choose this adapter? Ideal for users who want to reuse existing 425g blue CO2 cylinders with compatible Sodastream series machines (Terra, Duo, Art). Enables convenient cylinder refilling and conversion for continued use without needing specialized equipment. Package includes: 1 x Quick Adapter