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
CamelBak Type-M Mask Adapter – KommandoStore
NBC CBRN CAMELBAK GAS MASK BITE VALVE KIT
CamelBak HydroLink Gas Mask Adapter, Type M
Korean K1, Israeli M15 NBC CBRN Gas Masks or similar Drinking System Canteen Adapter
Camelbak Hydrolink Foliage Bite Valve quick release Type A & M Mask adapters - Walmart.com