an inflator housing having two walls, an inner wall and {TAIL ~ an outer wall}, {HEAD ~ the inner and outer walls} forming a combustion chamber 
an inflator housing having two walls , an inner wall and { TAIL ~ an outer wall } , { HEAD ~ the inner and outer walls } forming a combustion chamber
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH