HIGH QUALITY MATERIALS: Aluminum alloy material, sturdy material, no rust. Unique, elegant and concise design, makes the co2 bubbles more even and delicate. The sturdy structure can ensure long-term use.PERFECT DESIGN: The knurled design has good anti-slip performance and will not harm fish and shrimp in the aquarium. Simply install the U-shaped tube at the desired position on the edge of the aquarium. EASY TO INSTALL: More convenient than ordinary electronic tubes. It can be installed directly under the fish tank or fish tank. It is also suitable for low voltage systems or processor controlled systems. EASY TO CLEAN: Open the diffuser cover on top to replace it. It is recommended to clean it once a week to avoid the growth of bacteria. It replaces the need for large, large external reactors. WIDE RANGE OF USES: Suitable for most fish aquarium aquarium plants, safe and beautiful, to improve plant growth and health through sufficient supply of carbon dioxide. < /p>Note: The data are all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery quantity: (according to the main image)