Knipex 90 25 20 pipe cutter for composite pipes and protective tubes 210mm knipex 90 25 20 this 210mm l pipe cutter from knipex has been designed for cutting composite pipes with oslash 12 25mm and for cutting flexible protective tubes with oslash 18 35mm without potentially damaging a pipe inside a calibration arbor can also be fitted eg for geberit composite pipes with oslash 11 5 15mm the tool body is manufactured with high grade chrome vanadium electric steel oil hardene