A framed unit, with attachments to exclude water and control the entrance of air and light, designed to fit a ship's porthole.
NSN 6240-01-102-1555
NSN 6650-01-241-1269
NSN 6130-00-858-6476
NSN 5930-01-141-6967
NSN 5905-01-439-7644
NSN 5975-01-289-0972
NSN 6620-01-484-6904
NSN 6320-01-176-8367
NSN 6135-00-152-8729
NSN 6645-01-062-0905
NSN 6645-01-629-9657
NSN 5915-01-025-1362