Screw part having annular cross-section

A screw part for engaging a conduit system element, the screw part having an annular cross-section, the screw part comprising a base element which is hollow cylindrical and at least partially injection-molded from a plasticized polymeric mass containing fibers, the base element having at least one internal thread and/or one external thread and an inner channel for arranging and/or passing therethrough the conduit system element in an insertion direction (E), wherein the inner channel has at least one sealing section for arranging a circumferential seal for sealing between the inner channel and the conduit system element, and/or at least one support section for supporting and/or guiding the conduit system element, and/or at least one retaining section for directly or indirectly arresting the conduit system element, an insertion sleeve arranged in the base element coaxially with the inner channel, the insertion sleeve is at least partially encapsulated by the polymeric mass so that the insertion sleeve is at least partially surrounded by the polymeric mass radially facing towards the inner channel and radially away from the inner channel.