{HEAD ~ A piston} is disposed in each cylinder for {TAIL ~ reciprocal movement} therein in order to pump the fluuid from the inlet to the outlet 
{ HEAD ~ A piston } is disposed in each cylinder for { TAIL ~ reciprocal movement } therein in order to pump the fluuid from the inlet to the outlet
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH