Made of high quality material, which will be durable and reliable. With non-return function to prevent backflow when the pressure changes, and this can ensure the water plant table and CO2 cylinder from damage. It can count the volume of carbon dioxide and provide plants with enough carbon dioxide. Easy to install and use, a good choice to make your aquarium different. Double head and single head are available, you can choose according to your needs. Installation Method: Single Head Bubble Counter: Remove the sealing ring and install it on the interface of the trachea, then tighten the bubble counter. Add 4/5 of water into the bubble counter, then tighten the top cover. Cap the CO2 pipe, then tighten the trachea fixing nut. Double Bubble Head Counter: Add 4/5 of water into the bubble counter, then tighten the top cover. Cap the CO2 pipe, then tighten the trachea fixing nut. Features: Condition: 100% Brand New Item Type: Bubble Counter Material: Aluminum Alloy 0026 & Acrylic Color:
