A self sealing, pressure openable, slit type valve may be mounted in the cover at the dispensing orifice to control {HEAD ~ flow} through {TAIL ~ the orifice} 
through
A self sealing , pressure openable , slit type valve may be mounted in the cover at the dispensing orifice to control { HEAD ~ flow } through { TAIL ~ the orifice }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL