{HEAD ~ The inner drive} is driven about {TAIL ~ an axis} to pump a corrosive process fluid 
is driven about
{ HEAD ~ The inner drive } is driven about { TAIL ~ an axis } to pump a corrosive process fluid
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH