Our purple flexible ducting is used for ducting motorway communications services – if ever you drive through a section of roadworks on a motorway it is usually visible. It comes in a coil diameter of 63mm. This measurement refers to the outside diameter (O.D.), the inside diameter (I.D.) is 50mm. Full coil dimensions can be found in the table alongside the product image.The ribbed external wall ensures that the duct can withstand high compressive forces whilst the smooth inner bore resists any snagging of the water main during installation.The coupler enables two coils to be connected together as required.The length of this coil is 50m.