Description: Material: The CO2 Cylinder Connector is made of sturdy metal, 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 Gas Cylinder Tank adapter features internal thread TR21-4 and external thread W21.8-14 for secure connection; suitable for most standard soda water bottles 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 Soda Refill Bottle CO2 adapter, refilling your CO2 tank has never been easier. It's a practical tool for all sparkling water machine owners Specification: Material: Metal   Size Chart: 5.8cmx4.4cm/2.28inchx1.73inch Package Includes: 1 Piece CO2 Cylinder Connector Adapter Note: Please allow slightly errors due to manual measurement and different monitors.