Designed to protect utility cables and piping against external influences, the UtilityDuct is an easy to install surface ducting system. The 1-meter length channels are fabricated from chemical- and oil-resistant polymer concrete and are offered in three different versions. The DK100 is for light to medium duty service and DS100 and DS300 are for heavy duty service. All channels are engineered with an integrally cast-in edge rail for added strength. ACO Polymer Products. 800-543-4764.