These 0.2 micron Air Filters have a fine enough filter membrane that they can filter out microbes and bacteria.
They can be used with any oil free air compressor such as a pond pump, or other type of pump.
These can also be used as an airlock in the top of your fermenter, or to filter air going back into a cask when dispensing real ale.
This filter is not suitable for liquids and should be discarded if it gets wet.
Barb diameter measures approximately 9mm - 9.5mm.
