All types of CO2 cylinders can be used. With this quick adapter, you can continue to use traditional screw valve CO2 cylinders. This adapter is compatible with most 425 gram aluminum CO2 cylinders with screw valves from various suppliers. Designed for easy one-handed operation, it allows your CO2 aerator (type DUO) to be used seamlessly. Thread: TR21-4 Height: 37mm Outer diameter: 36mm Color: gold Material: aluminum Package Contents: 1 x Adapter Note: Light and screen display differences may cause slight variations in color between the image and the actual item. Measurement may vary by up to 1-3 cm. Our products are made with high-quality materials and designed for optimal performance and user satisfaction. Please review the product dimensions carefully to ensure compatibility with your needs. Detailed product information, including features and specifications, is provided in the title and description. If you have any questions, feel free to reach out. We aim to ensure your complete satisfaction.