{HEAD ~ The liner} 30 is formed of {TAIL ~ a flexible material} preferably a rubber such as a TPR rubber which is known in the plumbing art 
is formed of
{ HEAD ~ The liner } 30 is formed of { TAIL ~ a flexible material } preferably a rubber such as a TPR rubber which is known in the plumbing art
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH