said introducing and mixture forming means comprising a wax medium containing octenol, said medium having a porous exterior for allowing gaseous octenol to escape and mix with {HEAD ~ discharged carbon dioxide} in {TAIL ~ the housing} 
in
said introducing and mixture forming means comprising a wax medium containing octenol , said medium having a porous exterior for allowing gaseous octenol to escape and mix with { HEAD ~ discharged carbon dioxide } in { TAIL ~ the housing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL