a rupturable membrane sealed to said annular surface by a continuous seal around said opening, {HEAD ~ said continuous seal} being located on {TAIL ~ said annular surface} 
located on
a rupturable membrane sealed to said annular surface by a continuous seal around said opening , { HEAD ~ said continuous seal } being located on { TAIL ~ said annular surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL