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