SuperLite® 27® Helmet P/Ns 500-040, 500-041. 525-333 SL 27® Helmet Spares Kit, 525-341 SL 27® Overseas Spares Kit.
For an improved oral nasal mask fit, the SuperLite® 27® Helmet will begin shipping August 2014 with its previous oral nasal mask, the 510-690. It has been found that this oral nasal mask provides a better fit and improved operation of the nose block device. The 510-690 replaces the 510-747 oral nasal mask for the SuperLite® 27® Helmet only. The 510-747 oral nasal mask (color: black) went into production on all helmets and BandMasks® December 2009. The SuperLite® 27® Helmet now reverts to the pre-2009 oral nasal mask, the 510-690 (color: grey).
For more information click here: http://upgrade.kirbymorgan.com/support/bulletins/2014/bulletin-7-2014