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