TM 10-6640-215-13 4-10.  INTRODUCTION-continued. Alphabetical Index - continued Maintenance Title                                                          Paragraph Purge Intake Doors ..................................................... ................................................................................ 4-29 Receptacles ........................................................... ..................................................................................... 4-25 Roadside Stowage Box ................................................... ............................................................................ 4-55 RVP Testing System ..................................................... .............................................................................. 4-44 Thermal Stability Tester, JFTOT ........................................... ...................................................................... 4-52 Utilities Box ................................................................................................................................................. 4-11 Vacuum System .......................................................................................................................................... 4-37 Viscosity Testing System ................................................. ........................................................................... 4-45 Wall Switches ......................................................... .................................................................................... 4-23 Water Level Regulator .................................................. .............................................................................. 4-54 Water System .......................................................... ................................................................................... 4-39 4-11. REPAIR UTILITIES BOX. This task covers:   a. Removal b. Installation c. Installation INITIAL SETUP: Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) Portable Electric Drill, (Appendix B, Section III, Item 1) Twist Drill Set, (Appendix B, Section III, Item 1) Hand Blind Riveter, (Appendix B, Section III, Item 3) Materials/Parts Required Lockwashers, (Appendix F) Gaskets, (Appendix F) Adhesive, (Appendix E, Section II, Item 3) REMOVAL 1. Remove Door Assembly.  See figure 4-1. a. Remove seven rivets that secure door assembly to semi-trailer van. b. Unlatch door assembly from semi-trailer van and remove door assembly. 2. Remove Coupling Assembly. a. Remove four screws, nuts, and washers that secure coupling assembly to utilities box. b. Remove coupling assembly and gasket from utilities box. 3. Remove Direction Valve Lever. a. Remove four screws that secure direction valve lever to utilities box. 4-21