All types of CO2 cylinders can be used.With this quick adapter, you can continue to use traditional screw valve CO2 cylinders.This adapter can be used with almost all 425 gram aluminium CO2 cylinders with screw valve from different suppliers.With just one hand, your CO2 aerator (type DUO) can be used with this adapter.Thread: TR21-4Height: 37mmOuter diameter: 36mmColour:goldMaterial:aluminumPackage Contents:1 x AdapterOnly the above package content, other products are not included.Note:Light 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.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''t hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it!