(13)  Position  and  connect  pressure  regulator  to service pressure gauge tube assembly (7). (14)  Position   and   connect   supply   manifold   to supply manifold shut-off valve tube assembly (5). (15)  Position    and    connect    oxygen    recharge panel mount to recharge valve tube assembly    (3)    Position    and    connect    the recharge    valve    to    supply    manifold    tube assembly (4). (16)  Position   and   connect   cam   lever   valve   to supply manifold tube assembly (2). (17)  Position   and   connect   cam   lever   valve   to oxygen  gas  cylinder  pressure  gauge  tube assembly (1). Do NOT place unwanted torque on tube assemblies  when  valves  and  manifolds are tightened on panel. (18)   Tighten   supply   and   scuba   manifolds   and valves   Check   to   be   sure   that    no    tube assembly  has  been  placed  in  an  unusual bind. 6-9. AIR/OXYGEN PURIFICATION CYLINDER GROUPS-TYPE II (AIR/OXYGEN) SERVICING UNITS (See  Figures  7-2  and  7-3).    The  following  paragraphs contain    disassembly,    cleaning,    inspection,    repair    or replacement  and  assembly  instructions  for  the  Type  II (Air/Oxygen) Purification Cylinders Group. a. Type II (Air/Oxygen) Servicing Unit - Type I (Air) Purification Cylinder Group (See Figure 7-2). (1) See paragraph 6-7, Air Purification Cylinder Group  (Type  I)  for  disassembly,  cleaning, inspection,     repair     or     replacement,     and assembly instructions. b. Type    11  (Air/Oxygen)  Servicing  Unit  -  Type  II (Oxygen) Purification Cylinder Group (See Figure 7-3). (1) Disassembly Disassemble the oxygen purification cylinder group only to the extent necessary  to  repair  or  replace  a  defective part or parts. Any   disassembly,   cleaning,   inspection, repair or replacement and assembly of a part  or  parts  of  an  oxygen  system  shall be done in a contaminant free area. (a) If tube assemblies (1 and 2) have not been removed, unscrew and remove tube assemblies (1,2). (b) Unscrew and remove elbows (3). (c) Unscrew    and    remove    cylinder    cap    and upper   head   subassembly   (3   through   14) from cylinder (19) and cartridge (15). (d) Remove  screws  (4),  gaskets  (5)  and  dust cover from cap (7). (e) Remove   retaining   ring   (6)   and   separate upper head (9) from cap (7) Remove o-ring (8) from cap (7). (f) While holding the upper head (9) and head spring   (14),   remove   retaining   screw   (10) and    disassemble    upper    perforator    (11), lower   head   (12),   head   spring   (14)   and remove o-ring (13). NOTE Perform step (5) only when necessary to disassemble lower perforator (17). (g) Remove retainer screw (16), lower perforator    (17),    and    spacer    (18)    from cylinder (19). (2)   Inspection Refer to paragraph 603 b for general inspection procedures (a) Perforator    blades    (11    and    17)    for    any bending   or   dullness   (b)   Spring   (14)   for breaks or set. (3)   Repair or Replacement Refer to paragraph 6-3.c for general repair or replacement procedures (a) Replace a damaged cap or cylinder Damaged  threads may cause leakage. (b) Replace damaged or dull perforators Defective     perforators     will     not     puncture cartridge. 6-13