When clamped between flange surfaces, the edge coating engages, conforms to, and {HEAD ~ seals} against {TAIL ~ the flange surfaces} to provide a seal against both interfacial and intersticial migration of fluid past the gasket 
against
When clamped between flange surfaces , the edge coating engages , conforms to , and { HEAD ~ seals } against { TAIL ~ the flange surfaces } to provide a seal against both interfacial and intersticial migration of fluid past the gasket
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 TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH