["brand new and high quality\nFeatures:\nMade of high quality material, which will be durable and reliable.\nWith non-return function to prevent the backflow when the pressure changes, and this can ensure the water plant table and CO2 bottle from damage.\nIt can count the volume of carbon dioxide and supply the plants with enough carbon dioxide.\nEast to install and use, a good choice to make your fish for tank different.\nDouble for head and single for head are available, you can choose according to your needs.\nBubble Counter only,other accessories demo in the picture is not included.\n\nSpecification:\nMaterial: Aluminum Alloy\nSize: app.7.9x2.1cm/3.11x0.83in\nColor: Silver\nOptional Style: Double for Head, Single for Head\nQuantity: 1 Pc\nInstall Method:\nSingle for Head Bubble Counter: \n1. Take out the seal ring and install on the trachea interface of the valves, then tighten the bubble counter.\n2. Add 4/5 water in the bubble counter and then tighten the top cover. Plug the CO2 pipe and then tighten the trachea fastening nut.\nDouble for Head Bubble Counter:\nAdd 4/5 water in the bubble counter and then tighten the top cover. Plug the CO2 pipe and then tighten the trachea fastening nut.\n\nNote:\nNo retail package.\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Contents:\n1 x Bubble Counter"]