The Motor Guard MHT-7200 Compressed Air Desiccant Dryer features a unique cartridge that combines an activated carbon inner element to remove oil vapor to less than 0.003 ppm with a high-capacity silica gel desiccant dryer that delivers a -40 degrees F dew point to the spray booth. Two full quarts of silica gel desiccant beads help ensure long filter life and a sealed, disposable cartridge (No. M-720) and spin-off T-handle provide for a quick and clean cartridge change. A color-change (blue to pink) sight glass signals the need to replace both cartridges.