An adhesively backed strip of foam or sponge rubber is adapted to be removably secured within {HEAD ~ the upper peripheral edge} of {TAIL ~ a conventional oxygen mask} used to deliver oxygen to a patient 
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An adhesively backed strip of foam or sponge rubber is adapted to be removably secured within { HEAD ~ the upper peripheral edge } of { TAIL ~ a conventional oxygen mask } used to deliver oxygen to a patient
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH