ITEM NAME:2x Tube Connect Aquarium CO2 Diffuser Carbon Dioxide Generator Bubble Counter Description: High-grade polished stainless steel CO2 diffuser, and Aluminium Aquarium Inline CO2 Bubble Counter with build in check valve. Helps to ensure plants receive proper amounts of CO2, improve the growth and health of your plants with sufficient CO2 supply. 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 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. Suitable for both internal use and external use. Specification: Material: Acrylic + Metal + Glass 16mm Size: LxWxDia.ï ¼Å¡ Approx. 135x55x30mm / 5.31x2.17x1.18inch Ends External Dia.: Approx. 16mm / 0.63inch Suitable for 22mm(internal diameter) pipe. Bubble Counter Length: Approx. 8cm/3.15inch Package Includes: 1 Piece CO2 Diffuser 1 Piece CO2 Bubble Counter Note: The CO2 diffuser may release big CO2 bubbles during its first 1-3 days of usage. When ceramic disc becomes saturated with water, it will then release fine CO2 bubbles, this is normal and may take up to 3 days. 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: DMO0015422019433946.High-grade polished stainless steel CO2 diffuser, and Aluminium Aquarium Inline CO2 Bubble Counter with build in check valve. 1 Piece CO2 Diffuser. Easy to read and easy to maintain. 1 Piece CO2 Bubble Counter.