Polypipe Medium Density Polyethylene (MDPE) Water Service Pipe is available in 12 Bar pressure class and a choice of diameters to suit any project. A robust, easy to handle polyethylene pipe - it is suitable for potable and non-potable applications depending on colour. Blue 20 to 63mm MDPE Water Service Pipe is suitable for underground potable water services. This particular coil is 25mm in diameter and 100 meters in length.