Function : 1 . This adapter is easy to use and fills the soda tank with carbon dioxide. 2. The adjustable valve stem is compatible with any variety of cylinder valve. 3. The advanced design of the adapter means no leakage when attaching the adapter to the cylinder. 4. Made of high-quality aluminum alloy, wear-resistant and durable, and not easy to damage. 5. Integrated pressure relief valve. With 3000 psi gauge. Specification: Item Type: CO2 Refill Adapter Material: alloy aluminum Colour: silver Weight : approx. 105g / 3.7oz Gauge: 3000psi Interface: 1 / 8NPT Internal thread: TR21-4 How to use: 1 . Using a suitable spanner, connect the control valve to the adapter. 2. Hold the cylinder firmly with one hand and attach the adapter / regulator to the cylinder with a wrench. 3. The pin in the adapter will press the valve on the cylinder and open the gas flow. 4. Continue tightening the adapter on the cylinder. Package List: 1 x adapter valve 1 x gasket 1 x key 2 x sealing rings 1 x screw note : Monitors are not calibrated same, the color of the items displayed in the photos may be slightly different from the real object. Please take the real one as standard.