A retainer ring can be installed at {TAIL ~ the end} of the tubular body opposite to {HEAD ~ the flange} to secure the surgical port in the body wall 
A retainer ring can be installed at { TAIL ~ the end } of the tubular body opposite to { HEAD ~ the flange } to secure the surgical port in the body wall
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH