Flexible fittings for corrugated tubing

Claim 1

A flexible coupling for interconnecting the ends of corrugated tubes comprising a straight-walled tubular body section having a substantially uniform thickness throughout, a plurality of locking lugs formed in the tubular body section at one end thereof, each locking lug projecting into the interior of the tubular body section and including a guiding surface portion across which corrugated tubing slides when it is inserted into the tubular body section for connection thereto, and an abutment surface portion Adjacent the guiding surface portion for preventing removal of corrugated tubing from the tubular body section, each locking lug being positioned between an adjacent pair of corrugations in tubing inserted into the tubular body section after the first corrugation of the adjacent pair clears the guiding surface portion whereby removal of the tubing is prevented by engagement between the first corrugation of the adjacent pair and the abutment surface portions of the locking lugs, and the plurality of locking lugs including at least a pair of lugs spaced from one another in a line substantially parallel to the longitudinal axis of the tubular body section at the end thereof where the lugs are located, the locking lug closest to that end of the tubular body section projecting into the interior of the tubular body section a distance slightly less than the other locking lug of the aligned pair.