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