Feature: 1. SUITABLE MODELS: Male thread soda water CO2 adapter connector is applicable for DUO, for TERRA, for Art soda water machines. 2. THREAD AND OPERATION: The thread of our CO2 adapter is TR21 4 male thread can be inserted after removing the base of 60L CO2 cylinder, there are different operation methods according to different cylinders, easy to install. 3. POLISHED SURFACE AND GOOD SEALING: Soda water CO2 adapter is with well polished surface and with good sealing so the CO2 will not be leaking. 4. EASY TO CARRY: The overall weight of this soda machine CO2 connector is light and very easy to carry, you can take the connector with you at all times. 5. MADE OF BRASS AND ALUMINUM ALLOY: Soda water CO2 adapter is made of brass and aluminum alloy, resistant to corrosion, durable and safe. Specification: Item Type: Soda Water CO2 Adapter Color: Purple Thread: TR21 4 Thread Function: Connect the TR21 4 threaded soda cylinder to for DUO, for TERRA, for Art soda water machines using quick connect cylinders. With this quick adapter, you can continue to use spiral valve CO2 cylinders. Application: This adapter can be used for almost all 60L aluminum CO2 steel cylinders with spiral valves. . Package List: 1 x Soda Water CO2 Adapter1 x Washer Note: If it is found that the TR21 4 thread soda bottle cannot be placed into the machine when using a connector, the baffle at the bottom of the machine needs to be removed before the connector and cylinder can be placed together into the machine.