TM 5-4220-231-14&P (3) Remove tube     (10)   by   positioning     a 8,9 10 wrench   on   union   nut   (8)  and   turning nut   counterclockwise. Remove, cut, and discard O-ring (9). Repeat operation to   remove tube    (11)   from the   opposite side    of   the   valve (1). Turn union nut (12) clockwise. Remove, cut, and discard O-ring 12,13 15 14 (4) Remove valve (1) attached to brackets (16)   from   back   of  panel by removing the   four   screws (14)   and A* flat washers (15). 17 16 (5) Remove the two    nuts (18),    from 1 bolts/studs (17)   and    remove the   two valve    brackets (16)   from   valve (1). 16 Replace bolts   and   nuts   on  valve. 18 7 b. Replace 6 (1)   Remove and retain the following 5 parts    from    the new supply valve: 4 14 stem   nut   (2),   stem    spring    (3),   name plate   (4),   stop    plate   (5),  handle (6), and   grounding spring    (7). "6 2 3 4-12