Please note dimensions are outside diameter. External diameter - 178mm Description We offer a technically advanced and comprehensive range of ducting systems. We are well placed to meet the needs of all civils, utility and telecommunication markets. These ducting system offer the advantages of a lightweight flexible product combined with high strength and durability. Manufactured in polyethylene the pipe is normally supplied in either 6m lengths or 50m coils. The external corrugated profile gives the product added strength and the internal bore is smooth to prevent cables from snagging. If required a watertight joint may be achieved by using two profile seals. The Naylor ducting system comprises of three main components: Ducting Pipes Access Chambers Covers and Frames Naylor 50-300mm ducting is manufactured to BBA and BS EN1386 as required by the Highways Agency.