In {TAIL ~ 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 the vessel 31 
In { TAIL ~ 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 the vessel 31
OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH