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