Filter Regulator Lubricator FRLThe Filter Regulator Lubricator (F.R.L.) is designed to remove compressor lubricants, dirt and water from the air stream. The built in regulator can reduce the air pressure to extend the life of your tools. The lubricator adds atomized tool oil to the air stream to lubricate your pneumatic tools. If you need regulated, clean air for your tools, the F.R.L. is an effective component of your air system.