AFC breathing air filter insert, flangeless, LARK

The AFC insert for breathing air filters CPF-20 CLEMCO, flangeless.
The insert is used for preparing the breathing air for the blasting helmet which will be used during blasting works.  
The filter cleans the air only from water and oil particles with the size of 0.5 micrometer 
The filter insert should be replaced after about 400 hours of use (every 3-4 months).