In normal operation, an inner oblique surface 46 of the seal cover 24 meets a corresponding inner oblique surface 47 on {HEAD ~ the lip} 37 of {TAIL ~ the vessel} 31 
of
In normal operation , an inner oblique surface 46 of the seal cover 24 meets a corresponding inner oblique surface 47 on { HEAD ~ the lip } 37 of { TAIL ~ the vessel } 31
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 OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH