TM 5-4220-231-14&P (2) Remove hex-head screw (1)   from center of   regulator handle (4)   and remove center spacer (2). Remove the    three hex-head screws (3)  from handle; remove handle. Carefully 6 remove the bushing (5)    and the 3 4 neoprene sleeve (6). (3) Remove tube (11)   from    positionable elbow (10)    by   positioning a   wrench 10 on   both    the   union    nut   (9)   and   the elbow (10). Turn union nut counterclockwise. Remove, cut,   and discard O-ring (12)    which is    on elbow. 9 1 1 12 (4) Remove tube (14)   from    positionable 13 elbow (13) by   positioning a   wrench on   both   the   union    nut   (15)   and   the elbow (13). Turn union nut counterclockwise. Remove, cut,   and discard O-ring (16)    which is    on elbow. 14 15,16 (5) Perform step a   of   Para. 4-3,    and remove HP filter from regulator housing. *0 9 1 1 3 174 *1, 4-7