Features: 1.This is a 4?in?1 high?performance CO2 diffuser for DIY CO2 system (1?2 bar) and compressed CO2 system, suitable for fish tank up to 300L. 2.This carbon dioxide atomizer has built-in multi-functions, including check valve, bubble counter, ultra-micropore atomization and U-shaped air inlet, suction cup is also included. 3.It is convenient to use, easy to install, and has a good refinement effect. 4.CO2 system is designed planted tank use. Lost cost and durable. 5.Suction cup is also included for mounting. Specification: Description: This is a 4 in 1 high performance CO2 diffuser for DIY CO2 system (1-2 Bar) and compressed CO2 system, for up to 300L aquarium. This Co2 atomiser with build in multi-funional all in one, included check valve, bubble counter, ultramicropore atomization and U-shape air intake. Suction cup is also included for mounting. Features: 1.This is a 4?in?1 high?performance CO2 diffuser for DIY CO2 system (1?2 bar) and compressed CO2 system, suitable for aquariums up to 300L. 2.This carbon dioxide atomizer has built-in multi-functions, including check valve, bubble counter, ultra-micropore atomization and U-shaped air inlet, suction cup is also included. 3.It is convenient to use, easy to install, and has a good refinement effect. Package included: 1 x 4 in 1 CO2 diffuser