New in package U.S. Military issue gas mask hose extension (40 mm).  Also fits most NATO, Israeli, and Russian masks.  

Measures approximately 30 inches in length, and when stretched, measures approximately 40 inches in length.  

Can be linked together in several lengths to provide one longer extension if needed.  

Unsurpassed U.S. manufactured quality at an unbeatable price...............

• NSN # 4720015159261
• Media for Which Designed: Air single response
• Cross-Sectional Shape Style:Round
• Inside Diameter:1.030 inches nominal
• Outside Diameter:1.200 inches nominal
• Part Number 5-1-2756-30