Modular Filter/Regulator & Lubricator (Gauge Included), 1/4" NPTSpace saving, two piece combination is a popular air preparation unit Attached in series using spacers and piping adapters, which make the two components easily removable and mountable without disturbing the pipe line Come complete with a wall mounting bracket Regulators are used to maintain a steady outlet pressure, unaffected by variations or fluctuations in the inlet pressure Filter used to separate dust, dirt, moisture and other contaminants from