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