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