A controller is preferably in communication with {HEAD ~ each} of the valves for selectively moving each of the valves between an open position and {TAIL ~ a closed position} 
A controller is preferably in communication with { HEAD ~ each } of the valves for selectively moving each of the valves between an open position and { TAIL ~ a closed position }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL