TM 9-2320-209-20-3-2 (d) Pipe plug CAUTION Fittings are made of soft brass. They can be stripped if tightened too much. Tighten fittings just enough to stop air from leaking. NOTE The pipe plug on the air supply valve is used for this typical procedure. FRAME 1 1. Using 3/8-inch combination box and open end box wrench, screw in and tighten pipe plug (1). NOTE Follow-on Maintenance Action Required: 1. Start engine and let it run until air pressure gage reads between 65 and 125 psi. Refer to TM 9-2320-209-10. 2. Stop engine. Refer to TM 9-2320-209-10. 3. Do air system leak test. Refer to Part 1, para 1-5. END OF TASK 13-161