TM 5-4220-231-14&P b. Replace (1) Remove the   following parts    from    the new    high    pressure regulator housing (8): hex    head     screw     (1),    center 8 spacer (2),   three     hex   head    screws (3),  handle   (4),  bushing    (5),  neoprene sleeve     (6),  and   hex   nut   (7).    Retain 6 7 all  removed parts. 4 5 2 (2) Lubricate new     O-ring     (17),    (21), 17 M83248/2-908, M83248/2-210 with 13 silicone     compound (Item   9,  Appendix D)  and    place    on    positionable union 8 21 12 20 (3) Install   filter   (12),    with  tailpiece (20) and   positionable union   (13)   attached, to   regulator housing     (8)   by   turning union   clockwise. 9 16 (4) Lubricate new   O-ring    (16),   M83248/2- 908,    with   silicone    compound (Item   9, Appendix D), and place on positionable elbow (9). Install positionable elbow     (9)   in   regulator 8 housing (8) by turning elbow 12 clockwise. Position elbow    correctly 20 and    finger-tighten nut. (5) Carefully position housing through opening from    back    of  panel. 4-84