Seal end attachment

A seal end attachment (11) is provided and includes a vessel (20) through which a working fluid flows, the vessel (20) being formed to define a recess (21) with a mating surface (22) therein, a seal (40) contacting the mating surface (22) and a pressing member (50) being more responsive to a high temperature condition associated with the flow of the working fluid than the vessel (20) and being disposed within the recess (21) to press the seal (40) against the mating surface (22) responsive to the condition being present.