TM 5-4220-231-14&P (2) Remove the   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 (4) and bushing (5). Carefully remove neoprene sleeve (6). Loosen and 7 remove hex nut (7)    from regulator 6 housing (8). Retain all removed 4 5 parts. (3) Place regulator housing in   opening from back of    panel. Install hex nut (7)    on exposed threads of    housing (8)   at   the    front   of   the panel. Tighten hex nut while positioning the regulator correctly for   attachment of 8 tubes to   elbows on    housing. 7 (4) Lubricate O-ring    (12),    M83248/2-010, 10 with silicone compound (Item 9, Appendix D),    and install on elbow (10). Position and    tighten tube (11) 9 to    elbow (10) by  tightening union nut (9)   clockwise. 12 (5) Lubricate O-ring    (16),   M83248/2-01 0, 11 with silicone compound (Item 9, Appendix D),    and install on elbow (13). Position and    tighten tube (14) to   elbow (13)    by   tightening union nut (15)   clockwise. 16 14 . ............. 15 13 4-9