One-way stainless steel check valve to prevent backflow of CO2 hoses, 4 mm hoses, regulators and diffusers in aquarium systems

The pneumatic check valve prevents backflow into the aquarium during emptying, thus protecting the function and lifespan of the carbon dioxide cylinder. NOTE: This check valve is only compatible with steel carbon dioxide pressure cylinders and cannot be used with homemade air and oxygen pumps, as the pressure is insufficient to actuate the valve.

In an ozone generator, an air check valve prevents ozone from flowing back into the air pump and damaging the impeller.

The aquarium check valve protects the circulation pump from backflow during a power outage.

This simple check valve is easy to install, requires no additional tools, and can be attached anywhere in seconds.

These one-way stainless steel check valves are suitable for CO₂ supply systems in aquariums, fish tanks, and other spaces.