The primary purpose of a water trap for Pre-Charged Pneumatic (PCP) compressors is to remove moisture, condensation, and oil aerosols from high-pressure air before it enters the airgun reservoir, preventing corrosion and damage to the air gun’s internal, sensitive components. As compressors operate, they generate immense pressure and heat, creating water vapor that condenses into liquid water upon cooling, which can cause significant damage if left in the system.