The ARO 1000 Series Combination 3 pc. Air Compressor Filter, Regulator and Lubricator with Gauge 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. Filters, regulators, lubricators, and piggybacks can be combined to form a combination unit filter. 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. The ARO-Flo combination unit filter is easily assembled using modular spacer kits.