A FRC unit is a combination of coarse filter, regulator and lubricator in one unit. The regulator can be selected in two pressure regulation ranges with 7 bar and 12 bar control pressure. There are two pressure gauge connections to choose from, depending on the flow direction. The rotary knob can be locked and secured against manipulation by a protective cap and a padlock. The alternative is the integrated E11 pressure gauge lock with key. It is possible to choose between manual and automatic condensate drain. The FRC unit of the D series is available in 4 sizes with a standard nominal flow rate of 160 to a maximum of 8,700 L/min.