{TAIL ~ the hollow part} has an opening that opens at an end face on a side opposite {HEAD ~ the suction part side end face} of the rotating shaft, and 
{ TAIL ~ the hollow part } has an opening that opens at an end face on a side opposite { HEAD ~ the suction part side end face } of the rotating shaft , and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH