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