Yet another feature of this noted service valve has {HEAD ~ the valve stem} including an annular flange, an annular notch, and {TAIL ~ an annular valley} 
Yet another feature of this noted service valve has { HEAD ~ the valve stem } including an annular flange , an annular notch , and { TAIL ~ an annular valley }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL