TM  5-4220-231-14&P 4-9    Crossover Valve    (DACC). This   task    covers: Replace INITIAL   SETUP Tools Equipinent Conditions General Mechanics Tool    Kit Remove front   cover    from   DACC    case     (Para. 3-15    1-2) O-ring    Installation and     Removal Tool Remove rear    DACC   panel     (Para.    3-15    3) Materials/Parts Reference Valve,     Ball  13229E4597-7 Para.     4-2,   General O-ring,    M83248/2-010 (2) O-ring,    M83248/2-904 (2) Silicone Compound (Item    9,  Appendix D) Nonionic Detergent Solution (NID)  GP (Item   17,  Appendix D) a. Remove (1  ) Determine location of   crossover valve. CROSSOVER VALVE (2) Remove the   tube (2)   from    position- 5 able elbow (5). Position a   wrench on   union    nut   (3),   and turn   union    nut counterclockwise. Remove, cut, and    discard O-ring (4)  from    end of elbow    (5). 3,4 (3) Remove tube (6)   from    positionable 9 elbow (9). Position a    wrench on union nut   (7),    and turn union nut 2 6 7,3 counterclockwise. Remove, cut, and discard O-ring (8)  from    end of 5 .4 elbow. Change 1 4-27