Liquid is introduced into the bladder via {HEAD ~ a valve} which fits through the side wall of {TAIL ~ the cylinder}  
Liquid is introduced into the bladder via { HEAD ~ a valve } which fits through the side wall of { TAIL ~ the cylinder }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH