Abstract: A length of flexible helically corrugated rubber tubing is provided with certain characteristics that enable it to be axially compressed to less than half of its normal relaxed length using minimal force while still providing a high resistance to crushing. The tubing has a wall with a uniform thickness, the wall defining external and internal threads with a specially defined pitch and thread height related to the wall thickness.

Abstract: A method of manufacturing a wire-reinforced flexible rubber hose that is particularly suitable for use in breathing air applications. The method includes positioning a section of wire-reinforced tubing on a forming mandrel and then positioning a sleeve of uncured rubber to cover the section of wire-reinforced tubing. Cording is then wrapped around the sleeve of uncured rubber such that each adjacent wrapping of cording is disposed between and separated by the wire helix of the wire-reinforced tubing. The sleeve of uncured rubber is cured while the cording is wrapped thereon to form a cured hose.