Azoo Plastic Check Valve

Plastic check valve for water plant aquariums. The check valve is usually placed between the CO2 regulator and the bubble to prevent water from back-flowing to the regulator.

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CO2 Brass Check Valve

These are the highest quality industrial-grade Brass Check Valve from German Air Pressure Systems. They are heavy-duty enough for food-grade liquid as well. Just like you, we also thought that these were unnecessarily overkill for...

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Dennerle CO2 Check Valve

A very high-quality German CO2 check valve for freshwater or marine applications. A mid-level & mid-priced, quality check valve between the Metallic and the Plastic units. Takes 4/6 mm (ID/OD) or 1/8" airline tubing.

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Red Sea CO2 Bubble Counter with Integrated Check Valve

Compact, Easy to use bubble counter with integrated check valve Check valve protects the gas system from backflow of aquarium water. Provides an accurate measurement of the CO2 flow rate.

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