A framed unit, with attachments to exclude water and control the entrance of air and light, designed to fit a ship's porthole.
NSN 5920-01-173-2598
NSN 6135-00-231-7257
NSN 5960-00-368-4084
NSN 6135-01-120-9812
NSN 5990-01-355-3239
NSN 6650-01-471-6476
NSN 5990-01-408-6554
NSN 6110-00-162-5519
NSN 6650-01-209-6318
NSN 6610-00-312-5148
NSN 5998-00-583-8617
NSN 4140-01-436-1878