Feature: 1. [High Silicon Boron Glass] Aquarium bubble diffuser has high transparency, ornamental, non toxic, anti corrosion, can be used in freshwater seawater tank. 2. [Nano Ceramic Piece] Fish tank bubble diffuser uses nano ceramic piece for the air outlet, high density, strong permeability, more delicate bubbles. 3. [Super Silent] This aquarium air refiner dissolved oxygen is high, avoid splashing, the vibration of the water body is very small, less than 20dB operation. 4. [Small And Exquisite] Compact aquarium dissolved oxygen diffuser, exquisite, delicate feel, can be used with small and medium sized fish tanks, easy to install. 5. [U Shaped Tube] U shaped bubble diffuser, to prevent the air tube folded resulting in poor air output, the air tube through it, stuck in the tank wall more beautiful. Specification: Item Type: Aquarium Bubble Diffuser Material: Glass. Package List: 1 x Aquarium Bubble Diffuser1 x U Shaped Pipe1 x Control Valve1 x Check Valve2 x Suction Cup Note: Manual measurement, please allow some errors.