In-Line Desiccant Filter/Dryer is ideal for paint-spraying applications. Removes dust, dirt, water vapor, and oil aerosols that may have bypassed main air filtration system. Blue desiccant bead lowers dew point to -40°F and removes all water vapor. It is often used directly upstream of blow guns or spray guns as final protection for critical parts blow off and paint spraying. A 40 micron, porous bronze element removes fine dirt particles, an oil removing media removes oil vapor, and desiccant beads adsorb water vapor. The see-through housing shows desiccant color change from blue to pink, which indicates that the dryer needs to be replaced.