CO2 bubble counter: The aquarium CO2 Meter is used in conjunction with bottle pressure and fine valve which can calculate the amount of carbon dioxide and provide enough carbon dioxide for plants. It allows aquatic plants to grow faster and healthier. Durable material: The CO2 regulator system is made of aluminum alloy and acrylic, which is harmless to plants and fish. It’s easy to install and use. Both ends of the metal material will not appear softening fracture. Backflow prevention: the precision-designed aquarium CO2 control valve absolutely prevents backflow, protecting the carbon dioxide cylinder from damage. Easy to read: Clear countertop design makes it easy to see bubbles, so you can adjust them as needed. It is more accurate and efficient. Easy to install: Add 4/5 of water to the top cover of the bubble counter, then insert the CO2 gas pipes at both ends and tighten the gas pipes to tighten the nut. Size: Approximately 82*20mm Colour: silver Quantity delivered: 1 piece