The TU1 series is Aventics' pneumatic tubing line — polyurethane (PUR), polyamide (PA), and polyethylene (PE) flexible tubing in standardized metric and fractional OD sizes from 4 mm through 12 mm. Color-coded options support color-key plumbing conventions, and standard 50 m and 100 m spool lengths cover typical machine-build and plant-air installation requirements. The TU1 platform pairs directly with the QR1 and QR2 push-in fitting series for complete pneumatic plumbing systems.