<ul><li> 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.</li><li>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.</li><li> 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.</li><li> 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.</li><li> 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.</li></ul> < /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)