Abstract: A plastic injection rail, subjected to an inner relative pressure for an engine, includes: a conduit body; a plug; and a junction part overmolded within a contact area defined by portions of the plug and the end of the conduit body. The junction part can fixedly attach the plug into the end of the body, and includes a first portion arranged around the contact area, and a second portion within a space between the conduit body and plug. The plug has a hollow projection that extends toward the plug head. The plug body includes hollow rings including a primary ring arranged at the level of the free end of the plug body and secondary rings arranged between the primary ring and plug head. The junction part presents a generally cylindrical shape formed by rings including a primary ring closest to the contact area, and secondary rings.

Abstract: A method for manufacturing an injection rail subjected to an inner relative pressure, comprises the following steps: providing an injection rail body, comprising at least one end to be closed, providing a plug shaped so as to close the end of the body, assembling the plug into the end of the body, positioning the assembly within a mold cavity in which an overmolding area is at least contiguous with a contact area defined by a portion of the plug and a portion of the end of the conduit body are in contact with each other, the overmolding area being shaped so as to delimit the shape of a junction part configured to fixedly attach the plug into the end of the conduit body, filling the overmolding area by matter injection in order to form the junction part, the overmolding area comprising a matter injection inlet opening into the contact area.