The Bendix® PuraGuard QC™ oil coalescing filter provides purified compressed air on any air braked vehicle. It consists of a spin-on housing, or cartridge, mounted to an aluminum body. The spin-on cartridge contains a drain valve for maintenance. For ease of serviceability, the spin-on cartridge can be removed without disconnecting the supply and delivery lines of the PuraGuard QC™ oil coalescing filter (OSC) from its mounting on the vehicle.