A third circumferentially extending groove 76 is formed in the inner surface 60 of the sleeve 14 at {HEAD ~ a level} between the passages 74 and {TAIL ~ the second groove} 68 so as to accommodate a first radial lip seal 78 
A third circumferentially extending groove 76 is formed in the inner surface 60 of the sleeve 14 at { HEAD ~ a level } between the passages 74 and { TAIL ~ the second groove } 68 so as to accommodate a first radial lip seal 78
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH