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