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