Yosoo U-Shape DIY 4 in 1 Co2 Diffuser for DIY Co2 System Check Valve Bubble Counter Planted Aquarium Brand new and high quality High transparency and it can create a sense of harmony and unity With the suction cup design, it is easy to install and operate Diffuser CO2 can provide a healthy environment for your fishes This Co2 atomiser with build in multi-funional all in one, included check valve, bubble counter, ultramicropore atomization and U-shape air intake