【Material】The CO2 Cylinder Connector is made of sturdy metal and rubber materials, offering you reliable performance and long service life. 【Efficient CO2 Cylinder Connector】Our CO2 adapter is designed to connect with your sparkling water machine seamlessly, ensuring a quick and efficient refilling process. Suitable for home or commercial use. 【Easy to use】This CO2 adapter is easy to install and use. Its ergonomic design makes it easy to install and use. 【Versatile Soda Maker Accessory】This CO2 adapter is a must-have accessory for your soda maker. It allows you to refill your CO2 tank effortlessly, making your soda making process more enjoyable. 【CO2 Quick Adapter for Filling Tank】With this CO2 adapter, refilling your CO2 tank has never been easier. It's a practical tool for all sparkling water machine owners. Specification: Material: Rubber, Stainless Steel Size Chart: Thread A: TR21-4 Thread or Thread B: G1/2-14 Thread Package Includes: 1 Piece CO2 Cylinder Connector Adapter (as you  choose) Note: Please allow slightly errors due to manual measurement and different monitors.