The invention relates generally to {TAIL ~ valves}, and, more particularly, to {HEAD ~ an automatic fluid switching valve} 
The invention relates generally to { TAIL ~ valves } , and , more particularly , to { HEAD ~ an automatic fluid switching valve }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD