<http://schema.org/telephone>
"1-800-277-3458"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.discountfilterstore.com/in-line-filters.html?amp%3Bsize_advertised=12+x+2-1%2F2&certifications=NSF%2FANSI+Standard+42&mode=list>