68mm Outside Diameter x 60mm Inside Diameter, Specialist Woodworking & Timber Processing PU Ducting, 10 Metres, TIMBERDUC PUR 531 AS, Wall Thickness 0.4mm, Weight 0.340 Kg per Metre, Maximum Vacuum Pressure 0.145 bar, Working Temperature -40°C to +90°C, Working Pressure 0.405 bar, Norres