Kirby Morgan® discontinued manufacturing the KM57 Helmet on October 17th 2016.
Spare parts, kits and accessories continue to be available for the KM57 helmet.
Here is a link to the exploded view of the KM57.
Here is the KMDSI Bulletin announcing the discontinuation of the KM57 Helmet:
Contact us for any parts, kits and accessories you may need for your KM57 Helmet.
Images of Kirby Morgan® Helmets, Masks, or logos are registered trademarks or Kirby Morgan Dive Systems Inc.®. Used with permission.