DUO plastic tubing PUN-4X0,75-DUO-BS Standard O.D tubing, for QS plug connectors, CN and CK polyurethane fittings (not approved for use in the food industry). Outside diameter=4 mm, Bending radius relevant for flow rate=17 mm, Inside diameter=2,6 mm, Min. bending radius=8 mm, Temperature dependent operating pressure=-0,95 - 10 bar