A flat rigid item provided with holes or similar means for attaching to a container for the purpose of holding an observation window in place.
NSN 2925-01-215-5022
NSN 6135-01-584-0941
NSN 5835-01-219-0586
NSN 5999-01-147-3906
NSN 5920-01-466-9498
NSN 5910-00-168-1026
NSN 5905-01-015-1665
NSN 5996-01-160-5588
NSN 6130-00-402-5608
NSN 5985-01-177-1616
NSN 5930-01-574-9911
NSN 6220-01-161-2836