said {TAIL ~ fluid seal assembly} comprising at least one seal groove in {HEAD ~ said sleeve} with two axially spaced radial sealing wall surfaces, said sealing wall surfaces being opposed and substantially parallel, one with respect to the other 
said { TAIL ~ fluid seal assembly } comprising at least one seal groove in { HEAD ~ said sleeve } with two axially spaced radial sealing wall surfaces , said sealing wall surfaces being opposed and substantially parallel , one with respect to the other
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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