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