Features: The TR21-4 to W21.8-14 adapter is designed to seamlessly connect different standard CO2 cylinders to sodas makers, ensuring a stable gas supply for consistent carbonation. Crafted with brass and stainless steel, this adapter offers excellent corrosion resistance and pressure endurances, extending its lifespan significantly. Perfect for consumers looking to make carbonated drinks home, providing a reliable connection for their sodas maker's CO2 needs. Suitable for various setting including cafes, bars, and outdoor activities like camping or picnics, offering convenience in adding fizzing to beverages. Equipped with a sealing rings to prevent gas leaks, this adapter ensures user safety during the carbonation process while being easy to install and remove with its threaded designs. Specifications: Texture: Brass+Stainless Steel Size: Approx. 1.1x3.07inch(2.8x7.8cm) Package Includes: 1 Set 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.