USGI Chemical-Biological Mask Nonmetallic Hose Assembly (M40, M42, M45, C50)

A US Genuine Issue non-metallic, flexible breathing tube assembly in new unissued condition and in original sealed packaging.

Designed for military respirator systems with 40mm threads - the M40, M42, M45, C50 series. Part of the broader JSLIST (Joint Service Lightweight Integrated Suit Technology) family of equipment

NSN

• 4720-01-515-9261
• 4720-01-378-6479

Features

• Standard 40mm NATO Threading: A 40mm female connector for the mask and a 40mm male connector for the filter or blower unit, ensuring universal compatibility with NATO-standard respirator systems.
• Flexible Corrugated Design: The "accordion" style allows for a wide range of motion without kinking or restricting airflow, which is critical for vehicle operators and tactical users.
• Chemical & Environmental Resistance: Constructed from non-metallic, synthetic rubber (typically butyl-based) to resist degradation from chemical agents (CBRN), UV exposure, and extreme temperatures.
• A-A-3174 Compliance: Meets federal commercial standards for RPI (Reinforced Plastic/Synthetic) air-conveying tubes.