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