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3. Check valve (CAS)
 
  

 

      ![backflow-valve-ppsk08-800x800](https://almeva.swiss/sites/default/files/perm/image/backflow-valve-ppsk08-800x800.jpg)  

Prevents backflow of flue gases into the boilers and possible leakage of flue gases into the living space through the boiler.

# Check valve (CAS)