It talks about intake dryer. Intake dryer does very little to stop moisture getting into your gun. Hills hand pumps use intake dryer. And after months of use, my guns still get moisture inside the airtube when I open them up. Moisture builds as the compressor heats up. So even with a intake dryer, you will get moisture going into your gun. The best way to stop moisture is having a output filter. Output filter will stop most if not all moisture right before it goes into your gun. Having a output filter is far more important than any intake filter.
