FBY-EL-F Highspeed is a lightweight plastic corrugated pipe with a highly slip-resistant inner layer made of polyolefin, flame-retardant, in the color white. This plastic corrugated pipe is used for flush-mounted, cavity wall, and screed installations. The advantage lies in the highly slip-resistant inner layer in types 20 and 25, allowing cables and wires to be easily pulled over longer distances. VDE 0605.