[Scope of application] This control value is applicable to carbon dioxide supply systems in aquariums, fish tanks, etc. [Maintain service life] This one-way return check valve can prevent water from pouring into the aquarium due to restoration and maintain the function and service life of the carbon dioxide bottle. [Corrosion protection] When used in an ozone generator, it can prevent ozone from flowing back to the air pump and cause corrosion of the propeller. [Effective and flexible] Our ozone control value. The aquarium can protect the drive head from water backflow due to power interruption. [High-quality material] It is made of stainless steel and is very durable.