Vacuum cleaner hose and method and apparatus for making the same

In a vacuum cleaner hose formed of polymeric material and having opposite ends and a plurality of annular corrugations between said opposite ends thereof, said corrugations comprising a plurality of alternating annular U-shaped crests and annular V-shaped valleys that are interconnected together by annular side walls, each said valley and each said crest defining a radius of curvature and a wall thickness at the apex thereof with said wall thickness of each said valley being thicker than the wall thickness of each said crest, each said side wall being substantially straight from said radius of curvature of its respective said valley to said radius of curvature of its respective said crest, each said valley being narrower than said crests and having a smaller said radius of curvature than said crests, the improvement wherein each said valley has an outside diameter of approximately 1.380 inches with said radius of curvature thereof being approximately 0.005 of an inch and wherein each said crest has an outside diameter of approximately 1.800 inches with said radius of curvature thereof being approximately 0.045 of an inch, said hose having approximately six said corrugations per inch of length thereof when said hose is in its relaxed condition and being adapted to be stretched in an elongated manner approximately 100% thereof from the natural condition thereof with an approximately three pound pull thereon.