This upgraded quick CO2 adapter offers even more flexibility. Not only can you connect it to the compatible soda makers mentioned above, but you can also use it to connect your old soda hose with TR21-4 Male Thread to a new soda water maker. This means you can continue using your existing equipment with the convenience of a quick adapter. Filling adapter can be used to refill small CO2 tanks from larger CO2 tanks,and the thread of larger CO2 tanks must be US standard CGA320, like , Canada. Please pay attention it's not suitable for UK, Germany and other countries, because the EU standard thread is W21.8. with a pressure gauge to the pressure will not exceed the pressure specification of the recipient tank. Please keep your empty pink cylinder for terra/art/duo in the freezer the night before for better fill results. Before inflating, put the pink co2 cylinder to be inflated in the freezer for 6-24 hours, and tilt the co2 big cylinder tank 45 degrees when inflating, so that the co2 pink cylinder can be inflated for the best effect. Please read the instructions carefully before operation. Our CO2 Quick Adapter is specifically designed to fit all 60L CO2 Cylinders with TR21-4 Male valve, ensuring seamless connection with your soda machine. Whether you have the DUO, Terra, or Art soda maker, this adapter is compatible with all of them. Specification: Material: Metal Color: As shown Applicable models: Suitable for So-dastream Duo/Terra/Art Pressure Gauge: The quick-connect CO2 adapter comes with a 2000psi pressure gauge Package Contents: 1 x CO2 adapter 2 x black washers 1 x yellow washer Note: If you have any questions about the product, please do not hesitate to contact us and we will reply within 24 hours. 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.