Components and Inspection Check Points Facepiece Assembly Molded   from   soft   rubber   compound. Ultravue®  facepiece  has  a  one-piece polycarbonate lens that is replaceable, five   adjustable   headbands,   speaking diaphragm and spring-balanced exhalation valve.  Three sizes in green and black rubber are available. Nosecup  and  spectacle  mounting  kit accessories available.  Breathing tube connects facepiece to regulator. Regulator Reduces high pressure air from cylinder   to   breathable   pressure   and controls  the  flow  of  air  to  facepiece. Pressure  demand  regulator  maintains positive  pressure  in  facepiece  during both inhalation and exhalation. Audi-Larm^TM Warning Alarm Sounds  a  continuous  loud  warning  at approximately   540   psig   for   about   6 minutes  when  equipped  with  a  rated 30-minute   2216   psig   cylinder.      Low pressure   alarm   assembly   located   at one end of flexible high pressure-hose that connects cylinder to the regulator. Cylinders 1.  Fully-wound Composite (aluminum liner  fully  wrapped  with  high-strength glass   filaments   except   for   the   thick neck area). 2.      Hoop-wound   (wrapped   on   sides only.      Crown   and   base   of   cylinders exposed). 3.  Steel. These cylinders have a capacity of 45 cubic feet of air and a rated service life of 30 minutes. Harness Harness  has  foam  padded  two-inch- wide strap at each shoulder, a padded strap across bottom of backplate, and a  chest  strap.    Backplate  is  made  of aluminum.  Cylinder is held in position by  ratchet-type  latch  that  can  engage any of four slots in the stainless steel spring clamp to accommodate various sizes of cylinders. Inspection Check Points Rubber:  distortion,  dirt,  cracks,  tears, holes. Harness:    breaks,    loss    of    elasticity, missing buckles and straps. Serrations: wear. Lens: cracks, scratches, tight seal. Exhalation    Valve:    visual    check    for cleanliness. Breathing Tube: cracks in corrugations missing or loose hose connections. Inspection Check Points Diaphragm Cap: securely in place. Pressure Gauge: damage. Main-Line and By-Pass Valves: functional with unit pressurized. Breathing    Tube    Connector:    threads stripped or worn. Inspection Check Points Warning   Alarm:   functional   with   unit pressurized. High-Pressure     Hose:     cuts,     severe abrasion, connector is hand tight. "O" Ring: in place, dirt and wear. Inspection Check Points Hydrostatic    test    date:    3    years    for Composite   and   Hoop-wound,   5 years for Steel. Cylinder pressure: 2216 psig. Body: cracks, dents, weakened areas. Valve: damage. Gauge: damage, fully charged. Inspection Check Points Straps, clips: wear, in place. Waist belt: wear, buckle functional. Backplate: damage or defects. Cylinder latch: holds cylinder tightly. 2