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The SP4500 Secondary Piping (which has not changed in construction or part <br /> number) bears "stick on" labels from underwriter's Laboratory as the nature of <br /> its material (High Density Polyethylene) and its corrugated configuration make it <br /> impractical to apply imprinted product labeling. <br /> The designation "CMH1422", represents the Underwriters Laboratories' file <br /> number which references the product as "Nonmetallic Piping, Flammable <br /> Liquid, Underground" for the purpose of secondary containment of petroleum <br /> products. <br /> I invite you to visit our web site (totalcontainment.com) where you may review a <br /> complete compilation of all of UL's and ULC's listings of TCI products. <br /> RXesL. <br /> Jhelden, V.P. Western Regional Sales <br /> Total Containment@, Inc. <br />