A conduit is provided between the cannisters, and a quantity of {HEAD ~ volatile fluid} is located in {TAIL ~ the cannisters} and conduit 
A conduit is provided between the cannisters , and a quantity of { HEAD ~ volatile fluid } is located in { TAIL ~ the cannisters } and conduit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH