{HEAD ~ an annular expander ring} in said groove radially inward of {TAIL ~ said seal ring}, said expander ring having a conical outer ring surface engageable with a radial inner side of said seal ring and a continuous radial sealing surface on one axial side thereof engageable with one of said groove sealing wall surfaces whereby said expander ring exerts a radially outward force on said seal ring 
radially inward of
{ HEAD ~ an annular expander ring } in said groove radially inward of { TAIL ~ said seal ring } , said expander ring having a conical outer ring surface engageable with a radial inner side of said seal ring and a continuous radial sealing surface on one axial side thereof engageable with one of said groove sealing wall surfaces whereby said expander ring exerts a radially outward force on said seal ring
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH