The body and the shroud define an impeller chamber including {TAIL ~ a radially inner surface} and {HEAD ~ a radially outer surface} 
The body and the shroud define an impeller chamber including { TAIL ~ a radially inner surface } and { HEAD ~ a radially outer surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD