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