Patent ID: 8210573

Claim:
Apparatus, including: a first corrugated pipe member and a second corrugated pipe member having substantially the same diameter, each having corrugations comprising a plurality of alternating peaks and valleys along their respective lengths, and transition portions between each adjacent peak and valley; a female engagement structure at one end of the first pipe member, said female engagement structure being defined by a peak of the first pipe member's longitudinally outermost corrugation and at least a part of the adjacent transition portion that defines the longitudinally outermost part of the first pipe member; a male engagement structure at one end of the second pipe member, said male engagement structure being defined by at least a part of a transition portion of the second pipe member's longitudinally outermost corrugation; the female engagement structure being temporarily resiliently expanded to receive the male engagement structure and thereafter return toward its original non-expanded configuration to grip the male engagement structure.