Abstract: Flexible, helically corrugated, seamless pipes and tubular conduits of indeterminate length. In some embodiments, these pipes or conduits are formed by a continuous corrugating process on a corrugator. In some embodiments, the pipes are collapsible and are configured to remain in the collapsed and un-collapsed state without the application of external force. Also disclosed are helical tubes include corrugations that follow a counterclockwise path and corrugations that follow a clockwise path. Also disclosed are dual helical tubes with helical corrugations configured such that a portion of each corrugation follows a counterclockwise rotation and another portion of the corrugation follows a clockwise rotation.

Abstract: A pipe coupling is provided with inner and outer diameter dimensions and structures optimized for connection with at least three different sizes of pipe or tubing.

Abstract: A coupling is provided with inner and outer diameter dimensions and structures optimized for connection with a variety of sizes and types of pipes and tubing, including the connection of three or more pipes to a coupling having at least one collapsible corrugated section.