Plastic Tubing Pun-4X0, 75-Bl Standard O.D Tubing, for Qs Plug Connectors, Cn and Ck Polyurethane Fittings (Not Approved for Use In theFood Industry) Outside Diameter=4 Mm, Bending Radius Relevant for Flow Rate=17 Mm, Inside Diameter=2, 6 Mm, Min. Bending Radius=8 Mm, Tubing Characteristics=Suitable for Energy Chains In Applications with High Cycle Rates