A steel underseal expander ring located within the seal ring groove under the seal ring is provided with an outer conical surface which engages one axial end of the seal ring and establishes {HEAD ~ an axially directed force component} on {TAIL ~ the seal ring}, thereby effecting sealing engagement of a side surface of the seal ring on the opposite side of the seal ring groove 
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A steel underseal expander ring located within the seal ring groove under the seal ring is provided with an outer conical surface which engages one axial end of the seal ring and establishes { HEAD ~ an axially directed force component } on { TAIL ~ the seal ring } , thereby effecting sealing engagement of a side surface of the seal ring on the opposite side of the seal ring groove
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