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