PCP Filter- cotton

I'd be more interested in verifying that no "water" got into my gun. Most compressores will go a long way before starting to leak oil past the piston rings.

Spending money on a "good", or quality filter, will go a long way in keeping your guns clean and dry. A good filter will also catch most oil if that bothers you. This filter NEEDS to go on the "pressure" side of the system.

Here's one guy you can talk to for proper filter info - https://www.topgun-airguns.com/

Mike
 
Add a better filter if needed to be sure more moisture and any oil smell is removed from the system. Many of us use this Tuxing three media filter although, if you feel the need, you can change media types at any time.

https://www.aliexpress.com/item/32891898253.html

A smaller one will probly do for some.

https://www.aliexpress.com/item/4000960926898.html?spm=a2g0s.9042311.0.0.2a034c4dL0nrJU

Possibly a filter similar to this if humidity is high in your area and your desiccant filters have to be replaced often.

https://www.ebay.com/itm/30MPa-High-Pressure-Air-Filter-Oil-Water-Separator-For-Air-Pump-Air-Tank/402600939671?hash=item5dbce2d097:g:pRoAAOSwy41f00pY