{HEAD ~ a seal ring} of {TAIL ~ generally rectangular cross section} in said groove, said seal ring having two radially disposed axial sides and a cylindrical outer surface in sealing engagement with said housing and being adapted to effect sealing engagement with one of said groove sealing wall surfaces, the axial thickness of said seal ring being less than the axial width of said groove; and 
of
{ HEAD ~ a seal ring } of { TAIL ~ generally rectangular cross section } in said groove , said seal ring having two radially disposed axial sides and a cylindrical outer surface in sealing engagement with said housing and being adapted to effect sealing engagement with one of said groove sealing wall surfaces , the axial thickness of said seal ring being less than the axial width of said groove ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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 OTH OTH OTH OTH OTH