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