Male and female part of a pipe coupling

A receiving part for connection with a plug to form a tubular sleeve, wherein the receiving part comprises: a cylindrical retainer part housing which has a front end opening, a rear end opening, and a through hole which extends between the front end opening and the rear end opening, wherein the receiving part-housing is adapted to the insertion of the front end opening for connection of the insertion order, to take; a pipe connection adapter which has a cylindrical connecting part, which is introduced into the receiving part-housings of the rear end opening, and thus connected to the receiving part casing; and a valve element which is mounted in the through hole of the receiving part-housing to a position in front of the cylindrical connecting part in order to allow the through-hole to be opened and closed; wherein the pipe connection adapter comprising: a support leg which extends from the front end surface of the cylindrical connecting portion axially in front of the cylindrical connecting portion; and a valve support ring which is fixed to a front end of the support leg; ...