The cartridge can include {HEAD ~ one or more valves} that are biased in a closed position to prevent {TAIL ~ odors} from escaping the cartridge 
are biased to prevent
The cartridge can include { HEAD ~ one or more valves } that are biased in a closed position to prevent { TAIL ~ odors } from escaping the cartridge
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH