Plastic Tubing Pun-3X0, 5-Si-500 Standard O.D Tubing, for Qs Plug Connectors, Cn and Ck Polyurethane Fittings (Not Approved for Use In theFood Industry) Outside Diameter=3 Mm, Bending Radius Relevant for Flow Rate=12 Mm, Inside Diameter=2, 1 Mm, Min. Bending Radius=9 Mm, Tubing Characteristics=Suitable for Energy Chains In Applications with High Cycle Rates