TM 5-4220-231-14&P b. Replace (1) From    the    new    primary     high   pressure regulator, remove the hex head screw (1)   from    the    center     of   the handle (4),     and remove center spacer (2). Remove     the   three    hex 8 head     screws (3)   from   the    handle. Remove     handle    (4)  and    bushing    (5). Carefully remove neoprene sleeve 7 (6). Remove hex    nut    (7)    from 6 regulator housing (8). Retain all 5 removed parts. 12 (2) Lubricate new O-rings (18), M83248/2-212, and    (19),    M83248/2- 010,    with   silicone     compound (Item   9, Appendix     D).    Place    O-ring    (17)   on tailpiece (9)   and    install    tailpiece in regulator housing by turning clockwise. Position    O-ring   (18)  in tee (10). (3) Place regulator housing in   opening from   back    of   panel. Install   hex    nut (7)  on  exposed threads of  housing    at the    front   of  panel. Tighten    hex    nut while positioning the regulator correctly     for   attachment of  fittings   on housing. (4) Lubricate new O-rings (15), M83248/2-904, and (16), M83248/2-010, with silicone compound (Item   9,  Appendix     D). (5) Place     O-ring    (15)   on   adapter (13), and install adapter in     regulator housing by turning clockwise. 15 8 Position    O-ring    (16)   on   adapter     (13). 12 Position and    tighten     tube     (12)    to 13 adapter     (13)  by  turning   union   nut  (14) 16 clockwise. 14 8 -@3 4 56 6 @@l 14 4-80