Protect your expensive CO2 equipment from counter flow by using the CO2 Brass Check Valve from Pet Store. This tiny check valve is made from the finest quality brass manufactured by German Air Pressure Systems. The check valve`s purpose is to ensure that the flow of water is only in one direction. A counter flow of water will be harmful to your CO2 regulator and cylinders. This happens when a pressurized Kalkreaktor strongly pushes the saltwater backwards. A check valve is therefore an important gadget to ensure that the flow stays in the same direction and thus protect your CO2 system.

The CO2 Brass Check Valve has earned the reputation of being the only qualified brand that is reliable and effective. It is strong and durable to take in even food-grade liquids. It is also easy to install. It is mounted inline and the tubing is soaked in warm water so that the valve can be easily attached. It is compatible with 1/8” airline tubing that is CO2 resistant and can also take 4/6 mm ID/OD tubes. This check valve is ideal to be used only in CO2 systems that are pressurized. With this check valve around, you can be sure that the big investment you spent in your CO2 system is ensured.

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 aquaristic purposes, but it has been proven that these are the ONLY qualified Check Valves for protecting your expensive CO2 equipment (Regulator & Cylinders) from saltwater with a pressurized Kalkreaktor pushing it backward vigorously. Takes 4/6 mm (ID/OD) or 1/8" airline tubing.