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