This is a Brand New Herbert Cooper Company HC36S Military Oxygen Mask Hose Line. Inside diameter is 7/8”, it’s 3’ (36”) long and made in 2007
INSIDE DIAMETER 0.875 INCHES NOMINAL FIRST END
WALL THICKNESS 0.125 INCHES NOMINAL
CROSS-SECTIONAL SHAPE STYLE B3 ROUND
MATERIAL DOCUMENT AND CLASSIFICATION QQ-W-423 FED SPEC SINGLE MATERIAL RESPONSE REINFORCING WIRE
MATERIAL STEEL CORROSION RESISTING REINFORCING WIRE
MATERIAL RUBBER BUTYL SINGLE PLY
MEASURING METHOD AND LENGTH 35 INCHES NOMINAL OVERALL
END INSIDE DIAMETER: 0.875 INCHES NOMINAL BOTH ENDS