USGI Chemical-Biological Mask Water Canteen Cap M1 NBC (M40, M42, M17, MCU-2/P, MSA)

This US Genuine Issue Water Canteen Cap is designed for the M40, M17, and MCU-2/P series of gas masks and standard 1QT or 2QT plastic canteens. Specifically engineered for Nuclear, Biological, and Chemical (NBC) environments, it allows military personnel to drink safely from a canteen while wearing a protective mask without breaking the critical face seal.

NSN

• 8465-00-930-2077

Features

• Item Name: Cap, Water Canteen (M1 NBC)
• Official Color: Green (Federal Standard 595, color 34087).
• Material: Plastic (typically polypropylene), rubber gaskets, and stainless steel internal components.
• Dimensions: Outside diameter of 1.750 inches and an overall height of 1.375 inches.
• Style: Tube-type with a breather hole and knurled gripping surface.
• Canteens: Fits standard USGI 1-quart and 2-quart plastic canteens with 28mm threads.
• Gas Masks: Designed to receive drinking hoses from NATO-standard masks such as the M17, M40, MCU-2/P, and MSA Millennium.
• Protection: Features a self-sealing pressure valve fitting and gasket that allows for safe hydration in Nuclear, Biological, and Chemical (NBC) environments without breaking the mask's seal.