An item with an integral porous or perforated plate, or with slits on the inside of a double wall.
NSN 6135-00-948-7061
NSN 6610-00-273-9019
NSN 5920-01-397-8380
NSN 5915-01-527-6498
NSN 6135-01-554-8523
NSN 5990-01-298-2494
NSN 5910-01-169-6396
NSN 5999-01-350-0677
NSN 5945-01-312-6596
NSN 5990-01-199-2846
NSN 5915-00-915-5733
NSN 7035-01-250-5744