The bladder has an annular form and a pair of opening extending through {HEAD ~ the bladder} in the axial direction of {TAIL ~ the bladder} 
The bladder has an annular form and a pair of opening extending through { HEAD ~ the bladder } in the axial direction of { TAIL ~ the bladder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL