Inside fluting
An item with an integral porous or perforated plate, or with slits on the inside of a double wall.
NSN 6620-01-388-8955
NSN 5915-00-925-7362
NSN 6110-01-464-7027
NSN 5999-01-158-9129
NSN 5945-00-343-8399
NSN 2925-01-062-2660
NSN 6130-01-117-4053
NSN 5965-01-141-6485
NSN 5950-00-869-2905
NSN 5985-01-495-8929
NSN 6320-01-393-7022
NSN 5975-01-651-8773