a conduit means for acquiring {TAIL ~ gas} from the gas line into {HEAD ~ said flexible bladder} 
a conduit means for acquiring { TAIL ~ gas } from the gas line into { HEAD ~ said flexible bladder }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD