ITEM NAME:Set of 2, Aquarium Bubble Counter with Adjustment Needle Solenoid Check Valve Description: Aluminium Aquarium Inline CO2 Bubble Counter with build in check valve. When the regulator is open, you will be able to calculate your CO2 injection rate by counting how many bubbles pass through the counter per minute, with the piece of mind that your equipment is protected in the event of water siphoning back towards your equipment. A must have for any tank with CO2 injection, a bubble counter allows the user to estimate the CO2 injection rate by counting how many bubbles pass through the counter per minute. A check valve prevents water from your aquarium from siphoning back into fragile and expensive CO2 equipment such as regulators and solenoids. Easy to read and easy to maintain. To use, simply unscrew one end and fill the bubble counter with water, or if you prefer a bright coloured solution to make it easier to read. Precise structure, durable stainless steel inner part with aluminum alloy to release CO2 by fine tuning. One way Co2 regulator valve applies nut lock design can effectively lock the CO2 tube, to prevent the accidents caused by loose. Specification: CO2 Bubble Counter Material: Aluminum Alloy + Glass Length: Approx. 8cm/3.15inch Type: Single Head Bubble Counter CO2 Adjustment Valve Material: Aluminum Alloy Spiral Diameter: Approx. 6mm/ 0.24inch Length: Approx. 4cm/ 1.57 inch Package Includes: 1 Piece CO2 Bubble Counter 1 Piece CO2 Adjustment Valve Note: For luxuriant aquatic container, it is recommended to use 2-3 CO2 bubbles for 1 second. Since the size above is measured by hand, the size of the actual item could be slightly different from the the size above. Due to the lighting effects, monitor settings,etc.There could be some slight difference in the color tone of the pictures and the actual item. SKU: DMO0015373619404975.Aluminium Aquarium Inline CO2 Bubble Counter with build in check valve. Easy to read and easy to maintain. Precise structure, durable stainless steel inner part with aluminum alloy to release CO2 by fine tuning.