A framed unit, with attachments to exclude water and control the entrance of air and light, designed to fit a ship's porthole.
NSN 5998-01-177-3763
NSN 5920-00-665-3973
NSN 5930-01-619-5848
NSN 5985-00-731-1856
NSN 5905-01-007-5606
NSN 5905-01-155-6492
NSN 5910-01-417-6291
NSN 6150-01-212-9010
NSN 5960-00-985-9059
NSN 5855-00-138-2386
NSN 6650-00-965-6418
NSN 5985-01-095-0018