MODULAIR 112 SERIES 342 REGULATOR PRESSURE RANGE 0-12 B WITH PRESSURE GAUGE D=50 0-16 B G 3/4 Option 662554 ( OPTION AND SPARE PART FOR MODULAIR 112 FILTRE-REGULATOR+LUBRICATOR KEY LOCKING DEVICE OF THE ADJUSTEMENT BUTTON DELIVERED ASSEMBLED WITH REGULATOR AND FILTER-REGULATOR )