Material: Metal construction for durability and reliable performance. Connection specifications: TR214 thread and 8 mm quickconnect outlet for a secure, robust connection and efficient CO2 transfer. Function: Cylinder refilling adapter that enables seamless CO2 transfer and quick, secure inflation from large to small bottles. Performance: Designed to optimize CO2 charging, supporting stable and efficient inflation across applications. Compatibility and target users: Suitable for home soda enthusiasts, restaurants, and those who need a CO2 charging solution. Use scenarios: 1) Home soda setup: refill small CO2 bottles from larger cylinders for ondemand carbonation of beverages. 2) Commercial use: quick and secure CO2 charging of small bottles in cafe or restaurant environments. 3) Scientific or hobby experiments: provide a stable CO2 source for various experiments and handmade carbonated drinks.