CamelBak CBR-X Protective Mask Adapter, NSN 8465-01-592-3266 (90806), Type S -- For M95-M98 Series - The ArmyProperty Store
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Camelbak Chem-Bio Hydration Reservoir System. Pictured with Standard Bite Valve, Type M (MSA), Type A (Avon), and Type S (Scott) Gas Mask Drinking Tube Adapters. : r/gasmasks