Chapter 10 Air Supply Devices and Pneumatic Compo 10.1.3 F.R.L Combination F.R.L Combination is short for the combination of an air filter,a pressure reducing valve and an oil mist lubricator.Their installation order is shown in Fig 10-8 1-Air filter 2-Pressure reducing valve 3-Pressure gauge 4-Oil mist Fig.10-8 F.R.L Combination lubricator 14 Homepage List Upwards Downwards Retumn ExitChapter 10 Air Supply Devices and Pneumatic Components 14 10.1.3 F.R.L Combination F.R.L Combination is short for the combination of an air filter, a pressure reducing valve and an oil mist lubricator. Their installation order is shown in Fig 10-8 . Fig.10-8 F.R.L Combination 1-Air filter 2-Pressure reducing valve 3-Pressure gauge 4-Oil mist lubricator