3/8" NPT Piggyback Air Filter & Regulator (FR) duo saves space by combining features of both the filter and regulator into one unit. Its polycarbonate bowl has a capacity of 7.4 oz. Contains a 3/8" push-to-connect drain tubing connection to channel content safely away during automatic draining, or can be manually drained by rotating the shut-off at the bottom. Next to the filter is the regulator, which “piggybacks” onto the filter and includes 1 5/8” dial gauge readings in both PSI/Mpa as well as a lockout knob to set desired PSI. Always install FR 20' feet down line of air compressor to allow air to cool and lessen the amount of water carried through the supply line. Max air flow: 140 CFM. Max operating pressure: 145 PSI.