TM 9-2320-209-20-3-1 d. Type B Replacement. FRAME 1 1. Using 13/16-inch open end wrench, screw in and tighten low air pressure switch (1) into tube and hose manifold (2). NOTE Check tags put on plugs (3) so that plugs are put back in right place. 2. Put two electrical plugs (3) into receptacles on switch (1). Take off tags. NOTE Follow-on Maintenance Action Required: Start engine and check operation of low air pressure buzzer. Refer to TM 9-2320-209-10. END OF TASK 7-270