said sleeve being adapted to rotate relative to said housing as said seal ring remains fixed against rotary motion relative to said housing, said one axial side of said expander ring being in sealing relationship with respect to the other of said groove sealing wall surfaces, the engagement of {HEAD ~ said conical outer ring surfaces} with {TAIL ~ said inner side} of said seal ring being at a location substantially at the radially inward extremity of the other of said axial sides of said seal ring 
with
said sleeve being adapted to rotate relative to said housing as said seal ring remains fixed against rotary motion relative to said housing , said one axial side of said expander ring being in sealing relationship with respect to the other of said groove sealing wall surfaces , the engagement of { HEAD ~ said conical outer ring surfaces } with { TAIL ~ said inner side } of said seal ring being at a location substantially at the radially inward extremity of the other of said axial sides of said seal ring
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