{HEAD ~ Actuation} of the piston heads serves to force {TAIL ~ water} under pressure through a suitable discharge pipe to a remote location such as a reservoir where the water can be converted into a usable form of energy 
{ HEAD ~ Actuation } of the piston heads serves to force { TAIL ~ water } under pressure through a suitable discharge pipe to a remote location such as a reservoir where the water can be converted into a usable form of energy
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH