The item named by the manufacturer is a diffuser assembly
NSN 6650-01-297-4376
NSN 5990-01-310-5630
NSN 5835-00-253-3453
NSN 2925-01-535-7235
NSN 5990-00-124-2556
NSN 5835-01-412-6901
NSN 6320-01-631-7828
NSN 5905-01-328-7904
NSN 5915-01-113-6834
NSN 6650-01-149-1448
NSN 6650-01-408-5089
NSN 5910-00-878-7601