{HEAD ~ A guide disc} with a contour corresponding to the impeller is further arranged between impeller and {TAIL ~ cover disc} 
is arranged between
{ HEAD ~ A guide disc } with a contour corresponding to the impeller is further arranged between impeller and { TAIL ~ cover disc }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL