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