A pipe plug connection comprising: a) a first connector pipe having a socket; b) a second connector pipe having an insertion means, which is insertable into the socket of the first connector pipe; c) a bayonet connection between said socket and said insertion means of said connector pipes (2,4), wherein the bayonet connection comprises at least one ring groove section (7,7'), which is arranged in the socket of the first connector pipe, and at least one bar section (8,8'), which is arranged on an outer circumference of the insertion means, and is configured to be lockable and detachable by means of a reciprocal rotation between said socket and insertion means, wherein each of said ring groove sections (7,7') are delimited on a side of an insertion opening, respectively, and at least one of said ring groove sections (7,7') is delimited on the other side from an end stop, and wherein the bar sections (8,8') are arranged and dimensioned such to be inserted through the insertion openings of the ring groove sections (7,7') and are configured slidable in said ring groove sections (7,7'); and d) an apparatus for locking of a closed bayonet connection, wherein the locking apparatus is fitted on the socket of the first connector pipe and comprises a support having a movable locking element, which is connected to the support, wherein the support is configured to exert a spring force, and wherein the locking element is configured as a movable pin, which is configured to be arranged into a selected ring groove section, and comprises a locking stop, which is spaced apart from the end stop of the selected ring groove section by at least the length of a bar section, which is to be locked, wherein the locking element, which is configured as a pin, is arranged to be movable and is guided in a lateral opening of the socket, which is arranged in a radial direction, in particular, and opens out into the selected ring groove section, such that it, in a closed state of the bayonet connection and due to the spring force of the support, assumes a locking position in the selected ring groove section, and wherein a bar section of the insertion means, which is positioned in the selected ring groove section, locks between the locking stop and the end stop, and thus locks the bayonet connection or rather locks against a rotation thereof, characterized in that the locking apparatus, which is fitted on the socket of the first connection pipe, is formed as an elastic ring, which comprises the support, which completely surrounds the socket of the connection pipe, and in that the locking element is connected to the elastic ring of the locking apparatus. a) a first connector pipe having a socket; b) a second connector pipe having an insertion means, which is insertable into the socket of the first connector pipe; c) a bayonet connection between said socket and said insertion means of said connector pipes (2,4), wherein the bayonet connection comprises at least one ring groove section (7,7'), which is arranged in the socket of the first connector pipe, and at least one bar section (8,8'), which is arranged on an outer circumference of the insertion means, and is configured to be lockable and detachable by means of a reciprocal rotation between said socket and insertion means, wherein each of said ring groove sections (7,7') are delimited on a side of an insertion opening, respectively, and at least one of said ring groove sections (7,7') is delimited on the other side from an end stop, and wherein the bar sections (8,8') are arranged and dimensioned such to be inserted through the insertion openings of the ring groove sections (7,7') and are configured slidable in said ring groove sections (7,7'); and d) an apparatus for locking of a closed bayonet connection, wherein the locking apparatus is fitted on the socket of the first connector pipe and comprises a support having a movable locking element, which is connected to the support, wherein the support is configured to exert a spring force, and wherein the locking element is configured as a movable pin, which is configured to be arranged into a selected ring groove section, and comprises a locking stop, which is spaced apart from the end stop of the selected ring groove section by at least the length of a bar section, which is to be locked, wherein the locking element, which is configured as a pin, is arranged to be movable and is guided in a lateral opening of the socket, which is arranged in a radial direction, in particular, and opens out into the selected ring groove section, such that it, in a closed state of the bayonet connection and due to the spring force of the support, assumes a locking position in the selected ring groove section, and wherein a bar section of the insertion means, which is positioned in the selected ring groove section, locks between the locking stop and the end stop, and thus locks the bayonet connection or rather locks against a rotation thereof,