TM 10-6640-238-13 4-86 4-38.    MANOMETER AIR REGULATOR VALVE. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 157) REMOVE Remove Manometer Air Regulator Valve.  See Figure 4-27. a. Close air outlet valve on air tank.  See Figure 4-23. b. Close air supply valve (1). c. Open air valve (2) and purge air from air lines. d. Remove air regulator valve (3) by disconnecting unions (4) on both sides of air regulator valve. e. Remove air lines with unions (4) and retain for reuse. INSTALL Install Manometer Air Regulator Valve.  See Figure 4-27. a. Install air lines and unions (4) to air regulator valve (3). b. Install air regulator valve (3) by connecting unions (4) on both sides of air regulator valve. c. Close air valve (2) and open air supply valve (1). d. Open air discharge valve on air tank.  See Figure 4-23. e. Verify proper operation of equipment.