The BW Hydrophobic Pump Filter Replacements (XT-RF-H50) fit the Personal Gas Monitor and come in a pack of 50. These filters are designed to stop water and dust particles from entering the monitor. Replacing the hydrophobic filters is simple. Unscrew the filter holder, pop in a new filter, and close it back up. Filters need replacing when dirt or water block the internal pump from receiving air samples. 50 per pack.

Part Number: XT-RF-H50