Releasable plug connection

In a releasable plug connection for semi-rigid pipes including a housing part having a passage for fluid, several cavities successively larger in steps for receiving connecting parts and an entrance for receipt of a pipe to be connected, wherein the shoulder of a first and smallest cavity serves as a stop for the pipe and the shoulder of a second larger cavity as an abutment for a sealing ring, the ring having an internal diameter less than the diameter of the pipes and being preceded in the plug-in direction by a retaining ring having inwardly projecting spring tabs which form a truncated cone pointing with its apex in the plug-in direction and capable of springing open elastically and a stop ring located between the retaining ring and the sealing ring, the side of which facing the spring tabs is shaped as a cone to limit movement of the spring tabs, there being arranged ahead of the retaining ring in the plug-in direction, a dismounting ring, axially slidable relative to the housing part, and having a conically tapered head portion that fans open the spring tabs of the retaining ring and against the side of the stop ring when the dismounting ring is pressed into the housing part to release the pipe, the improvement comprising a flanged ring portion on the stop ring of larger diameter than the cone shaped portion that rests against the shoulder of a third cavity larger than the second cavity and that serves as an abutment for the retaining ring and a supporting ring located in a fourth cavity preceding the third cavity in the plug-in direction between an end face of the flanged ring portion of the stop ring and an inwardly offset shoulder around the periphery of the entrance of the housing part to hold the retaining ring in place.