The ARO 1500 Series Standard Air Compressor Filter sets the standard for airflow performance. These air compressor solutions can keep your facility online and your equipment in shape because we combined best-in-class airflow performance with the flexibility to work in any environment. The air compressor filter can be used with regulators, lubricators, and piggybacks to form combinations. They are typically strung together in the F+R+L arrangement (three pc. combo) and F/R+L (two pc. combo) arrangement, although other configurations are also used depending on application needs. ARO-Flo combination FRLs with this air compressor filter is easily assembled using modular spacer kits.