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