A framed unit, with attachments to exclude water and control the entrance of air and light, designed to fit a ship's porthole.
NSN 5835-00-897-3123
NSN 2925-01-543-5571
NSN 6145-01-605-3228
NSN 6240-01-474-6914
NSN 4140-00-095-6452
NSN 6220-00-440-6596
NSN 5996-01-473-9904
NSN 5905-01-575-7819
NSN 6145-01-045-6713
NSN 5930-00-267-1830
NSN 5920-01-218-3885
NSN 5999-00-082-4056