The apparatus has {TAIL ~ a hollow body} , with {HEAD ~ an inflow} and an outflow for the fluid  
The apparatus has { TAIL ~ a hollow body } , with { HEAD ~ an inflow } and an outflow for the fluid
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH