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