This material is sufficiently firm enough to maintain its shape but sufficiently soft enough to provide for {HEAD ~ a sound insulation} between the sleeve 12 and {TAIL ~ a pipe} 34 
between
This material is sufficiently firm enough to maintain its shape but sufficiently soft enough to provide for { HEAD ~ a sound insulation } between the sleeve 12 and { TAIL ~ a pipe } 34
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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH