【REACTIVATE THE OLD CO2 CYLINDER】: You don't need to spend more money to buy an extra new quick connect co2 refill cylinder for your new soda maker machine, find the cylinders you used on your old machine in your kitchen and screw the valve adapter fitting on them and reuse them. We provide additional rubber rings, which are made of food-grade materials, safe and reliable, they can ensure a better sealing of the adapter. When original rubber ring aging, you can replace it. 【UNIVERSALLY FIT】 : This quick CO2 adapter screws onto 60L co2 cylinders with standard TR21-4 male vavle. It is suitable for newer soda maker that use quick connect co2 cylinders, such as TERRA, ART, DUO, GAIA, E-TERRA, Aqua Fizz, CRUSTAL 3.0, etc. It can also work with old adapter hose with black TR21-4 Male Thread to directly connect the CO2 tank and new soda water maker. 【EASY TO USE】 : The CO2 refill canister adater is easy to install and use. Just make sure to first take the plastic piece out of the bottom of soda maker machine. Insert the co2 cylinder with adapter already attached from directly underneath the unit and straight up into the tap instead. Make sure that thecylinder burst disk is facing outward. 【PREMIUM MATERIAL & CRAFTSMANSHIP】 : The CO2 cylinder adapter is well constructed with high quality aluminum alloy, polished and surface electroplated, which has excellent performance in terms of corrosion resistance, Leakage and rust prevention, high temperature ductility and low magnetic permeability. You can use this adapter to make carbonated drinks safely and leakfree, thus maximizing the use of your cylinder. 【SATISFACTION CUSTOMER SERVICE】: The co2 canister adapter use high-quality materials and we offer a friendly after-sale service. If you are not clear about the machine adaptation or there are various problems occur during the installation and use of the connector, please feel free to contact us, and our experts will provide you with appropriate solutions online.