Features: Experience seamlesses CO2 transfer with our cylinder refilling adapter, designed for quick and secure inflation from large to small bottles, perfect for enhancing your beverage making process. Crafted from metal, this adapter features a TR21-4 thread and 8mm quick connecting outlet, ensuring robusts and reliable connection for efficient gas transfer. Suitable for home sodas enthusiasts, restaurant owners, and creators, this adapter meets the needs of anyone requiring a CO2 charging solution. Whether you're making handmade carbonated drinks or conducting scientific experiments, this adapter provide a stable gas source for various applications. Its lightweight designs makes it easy to carry and install, offering convenience and efficiency in both domestic and commercial setting, ensuring you alway have access to freshs sodawater. Specifications: Texture: Metal Output Port Diameter: Approx. 0.31inch(8mm) Package Includes: 1Pc Adapter note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.