TM 10-6640-215-13 4-36.  REMOVE/REPLACE COMPONENTS OF AIR SYSTEM- continued. d. Connect air outlet hose at top of air tank. e. Connect air hose from compressor discharge to side of air tank. f. Electrically connect pressure switch at top of air tank, remove tags and attach conduit. 3. Install Flow Control Devices.  See figure 4-25. a. Apply teflon tape on male fittings.  Be sure to wrap teflon tape in same direction of pipe thread. b. Install stopcock valves by screwing valves into air system piping tees or elbows. 4. Install System Piping.  See figure 4-26. a. Apply teflon tape on male fittings.  Be sure to wrap teflon tape in same direction of pipe thread. b. Connect pipe nipple to elbow or coupling or valve. c. Connect union. TEST Test air system in accordance with operating procedures listed in paragraph 2-8c. 4-37.  REMOVE/INSTALL COMPONENTS OF VACUUM SYSTEM. This task covers: a.   Removal c.   Test b.   Installation INITIAL SET-UP: Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) Multimeter, (Appendix B, Section III, Item 1) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 157) General Safety Instructions WARNING ELECTRICAL SHOCK Before performing any maintenance actions on electrical equipment, ensure all electrical power has been turned off.  Death or serious injury may occur from failure to do this. 4-87