CO2 Glass Check Valve. Check valves are used to prevent water back flow in an airline or CO2 tubing. When using either an air pump or CO2 system, it is important to use a check valve to make sure water doesn’t siphon from your aquarium into your air pump or CO2 regulator. Water or any liquids can cause damage to an air pump as well as the needle valve of a regulator.
- Solid all glass construction
- Fits any standard 4mm airline or CO2 tubing
- Designed for aquarium use
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