Feature:1. CO2 refilling adapter is easy to use and can fill carbon dioxide into a soda bottle.2. The adjustable valve pin ensures compatibility with any cylinder valve changes.3. Integrated safety pressure valve, the interface is 1/8NPT, easy to install.4. TR21‑4 female thread connection, there will be no leakage when connected to the cylinder.5. With 3000psi pressure gauge, safe and reliable, it is a practical soda accessory.Specification:Item Type: CO2 Fill AdapterMaterial: Aluminum AlloyColor: Gold+BlackPressure Gauge: 3000psiInterface: 1/8NPTFemale Thread: TR21-4Weight: Approx. 104g / 3.7ozProduct Size: Approx. 64.2mm / 2.5inHow to Use:1. Use an appropriate wrench to connect the regulating valve to the adapter.2. Hold the cylinder firmly with one hand, and fasten the adapter/regulator to the cylinder with a wrench.3. The pin in the adapter will depress the valve on the cylinder and open the gas flow.4. Continue to tighten the adapter on the cylinder..Package List:1 x Valve1 x GasketNote:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.