The notch is located between {HEAD ~ the first end} and {TAIL ~ the annular flange} and houses a stem retaining ring 
The notch is located between { HEAD ~ the first end } and { TAIL ~ the annular flange } and houses a stem retaining ring
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH