ITEM NAME:Set of 2, Aquarium Bubble Counter with Ultra Thin Stainless Steel CO2 Diffuser Description: High-grade polished stainless steel CO2 diffuser, durable as well as elegant, adding a beautiful scenery to your aquarium. 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. Helps to ensure plants receive proper amounts of CO2, improve the growth and health of your plants with sufficient CO2 supply. Quantity: 2Pcs, Package includes a 304 Stainless Steel CO2 Diffuser, and a Aluminium Aquarium Inline CO2 Bubble Counter (Dual Head). Specification: CO2 Diffuser Material: 304 Stainless Steel CO2 Diffuser Bottom Diameter: 3.6 cm/1.41inch CO2 Diffuser Length: Approx. 30cm/11.8inch CO2 Bubble Counter Material: Aluminum Alloy + Glass Length: Approx. 8cm/3.15inch Type: Dual Head Bubble Counter Package Includes: 1 Piece CO2 Diffuser 1 Piece CO2 Bubble Counter Note: The CO2 diffuser disc must be screwed as tight as possible when installation. 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. For large aquatic container, it is recommended to use 2-3 CO2 bubbles for 1 second. SKU: DMO0015380019410093.High-grade polished stainless steel CO2 diffuser, durable as well as elegant, adding a beautiful scenery to your aquarium. The CO2 diffuser disc must be screwed as tight as possible when installation.