a motor coupled to {TAIL ~ the impeller}, the motor to rotate {HEAD ~ the impeller} to pump a liquid coolant 
a motor coupled to { TAIL ~ the impeller } , the motor to rotate { HEAD ~ the impeller } to pump a liquid coolant
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH