Do not disconnect service hose until service hose line has been bled of all air pressure. (5) Open  service  line  drain  valve,  located  on the source furnishing the breathable air. c. To charge scuba tanks (see Figure 4-4) (1) Connect yoke adaptor (21) to scuba tanks. (2) Be sure scuba manifold bleed valve (18) is closed. (3) Open manifold shut-off valve (10) (4) Adjust regulator (12) to desired pressure. (5) Open  scuba  manifold  servicing  valve  (14) and scuba charging valve (19) (6) Open  valve  on  scuba  tank,  charge  scuba tank to desired pressure using the manifold pressure gauge (16) as an indicator (7) Close scuba tank charging valve (19) (8) Close valve on scuba tank. Do  NOT  disconnect  yoke  adaptor  (21)  from scuba tank until flex hose (20) has been bled of all pressure (9) Bleed    flex    hose    (20)    pressure    at    yoke adaptor  (21)  bleed  screw  before  removing the yoke adaptor (21) from the scuba tank d. OXYGEN  half of Type II control panel (Figure 4- 4). (1) Attach  a  source  ,of  breathable  oxygen  to the recharge connection (30) on the oxygen control panel (2) Close   manifold   shut-off   valve   (31),   open oxygen  cylinders   (22)   to   be   charged   and place    cam    lever    valve    (26)    in    the    up position.  Open recharge valve (29) (3) Service  oxygen  cylinders  (22)  to  maximum 2265 psi for oxygen Type II gas cylinders (4) Close recharge valve (29) Do  NOT  disconnect  oxygen  service  hose  until the    service    hose    line    has    been    bled    of    all pressure. (5) Open service line drain valve located on the source furnishing the oxygen e. To charge scuba tanks (see Figure 4-4) (1) Connect yoke adaptor (42) to receiving tank (2) Be sure scuba manifold bleed valve (39) is closed (3) Open manifold shut-off valve (31) (4) Adjust regulator (33) to desired setting (5) Open   scuba   manifold   service   valve   (35) and scuba charging valve (40) (6)    Open    valve    on    receiving    tank,     charge receiving tank to desired pressure using the manifold pressure gauge (37) as an indicator (7) Close scuba tank charging valve (40) (8) Close valve on receiving tank Do  NOT  disconnect  yoke  adaptor  (42)  from receiving  tank  until  flex  hose  (41)  has  been bleed of all pressure (9) To   bleed   flex   hose   (41),   close   manifold service   valve   (35),   open   charging   valve (40),     open     manifold     bleed     valve     (39) Pressure gauge (37) should be  watched  to help   determine   when   pressure   has   been removed from the flex hose (41). (10)   Remove   yoke   adaptor   (42)from   receiving tank. 4-7