1、 1. Made of high quality material, which is non-toxic, safe, energy-saving and Eco-friendly. 2、 2. Can effectively improve the dissolution rate of O2, high diffusion efficiency, which is beneficial for the growth of aquarium plants. 3、 3. Build-in Check valve for better control of the O2. 4、 4. Suitable for fish tank in small size. 5、5. Comes with a suction cup, which is very easy and convenient to fix it on your fish tank. Features: 1. Made of high quality material, which is non-toxic, safe, energy-saving and Eco-friendly. 2. Can effectively improve the dissolution rate of O2, high diffusion efficiency, which is beneficial for the growth of aquarium plants. 3. Build-in Check valve for better control of the O2. 4. Suitable for fish tank in small size. 5. Comes with a suction cup, which is very easy and convenient to fix it on your fish tank. 6. Easy to use by connecting the oxygen pump with the diffuser. Specifications: Condition: 100% Brand new Item Type: Oxygen Diffuser Material: Acrylic Size:(Dia*L) Approx. 23*155mm / 0.91*6.10inch Package Include: 1 * Aquarium Oxygen Diffuser 1 * Check Valve