an annular expander ring in said groove radially inward of said seal ring, said expander ring having a conical outer ring surface engageable with {HEAD ~ a radial inner side} of {TAIL ~ 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 
of
an annular expander ring in said groove radially inward of said seal ring , said expander ring having a conical outer ring surface engageable with { HEAD ~ a radial inner side } of { TAIL ~ 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
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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