Features: Brand new and high quality Metal material design, reliable and durable, exquisite workmanship. Suitable for switching carbon dioxide control flows, simple operation. Precisely control the CO2 exhaust volume, set the required generation volume. Ergonomically design, easy to install without using any tool. The double head type can be directly connect to the pipe for use. Specifications: Material:Copper Type:Single Head/Double Head Single Head:Approx.1x4.1cm/0.39x1.61inches Double Head:Approx.1.6x4.6cm/0.63x1.81inches Package Includes: 1x Valve Regulator note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.