The 455 Is An All Stainless Steel Regulator With Superior Breathing Performance And The Added Advantage Of Compatibility With The SL 27, 17C, KM 37, KM 37SS, KM 57 Helmets As Well As The KMB 18 & 28 Band Masks.
The Side Block Assembly of both the KMB 18 and 28 receives the umbilical over the shoulder in the B configuration. They both come standard with the Tri-Valve® exhaust system, and the new BandMask® BandKeepers®
The Tri-Valve® Exhaust System has less breathing resistance than the older single valve exhaust. It retrofits to all previous Kirby Morgan BandMasks®. The BandMask® BandKeepers®, coupled with the redesigned hood, not only prevent any separation of the hood from the mask, but also make it impossible for the bands to separate from the mask.
The communications connections can be either a male waterproof "plug in" type or bare wire posts.The KMB 28B BandMask® is very similar to the KMB 18. Many parts on the KMB 18B are interchangeable with the KMB 28B. The major difference between the 18 and 28 is the material of the mask frame. The KMB 18 has a hand laid fiberglass frame (yellow) while the KMB 28B frame is an extremely durable injection molded plastic (black). The relative ease of production of the KMB 28 frame allows for a lower cost and quicker delivery of this mask. Other differences include: 1) The main exhaust body of the KMB 28 is part of the frame itself and uses a #545-041 main exhaust cover 2) no comfort insert is required on the "28" 3) the face ports for the 18 and the 28 differ slightly in size.

CE Certification:

The Band Mask has been tested and conforms to the performance requirements as set forth in Annex II of Directive 89/686/EEC and, as far as applicable, the EN 15333-1:2008/AC:2009 (Class C).

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  455 Balanced Regulator
  The 455 Balanced regulator sets a milestone in surface supplied breathing performance and will soon be compatible with all Kirby Morgan Helmets and Band Masks that feature the SuperFlow® 350 regulator. The regulator body is made of 316 stainless steel, as are all its other metallic components.
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  Air Train
  The air train diffuses incoming breathing air/gas onto the face port/lens to defog and ventilate.
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  Defogging Steady Flow Valve
  Provides an additional flow of gas into the helmet for ventilation and defogging.
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  Emergency (EGS) Valve
  Supplies backup breathing gas to the diver.
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  Head Harness (Spider)
  Keeps the mask in place on the divers head. The neoprene rubber spider has adjustment holes for varying the tension of the harness.
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  Gas Supply Non-Return Valve
  Gas Supply Non-Return Valve prevents loss of gas pressure in the event of umbilical damage, preventing a "squeeze".
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  Nose Block Device
  Allows the diver to block the nose to equalize ears.
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  Communications
  Communications are “non-modular” (like the SuperLite 17B helmet). When ordered with male waterproof connector (for 4 wire communications), the mask also includes bare wire posts. When ordered with bare wire posts (for 2 wire communications), the port for the mwp connector is plugged.
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  Stainless Steel Bands
  Bands hold the Hood/Face seal in place on the mask frame. They also provide the mounting studs for the Head Harness (Spider).
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  Side Block
  Multi use side block has additional ports built in to provide controlled air flow, if needed.
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  Silicone Oral Nasal Mask
  Made of a superior silicone material which is hypo-allergenic and has a longer work life than latex.
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  Tri-Valve® Exhaust with Whisker Wings
  Retrofits to many previous Kirby Morgan Helmets and BandMasks®, has less breathing resistance than the older single valve exhaust while providing an extremely dry hat. The Tri-Valve® Exhaust is made of a chemical resistant compound.