Knipex Tools 90 31 03 Bka Knipex Tubix Xl Pipe Cutter Knipex - 90 31 03 Bka. Partnumber 90 31 03 BKA. Model Knipex - 90 31 03 BKA. Cuts pipes with wall thicknesses up to 5/64" (2 mm). High-quality needle-bearings enable the cutting wheel and four guide rollers to cut with ease.