258mm Outside Diameter x 250mm Inside Diameter, Specialist Woodworking & Timber Processing PU Ducting, 10 Metres, TIMBERDUC PUR 532 AS, Wall Thickness 0.6mm, Weight 1.900 Kg per Metre, Maximum Vacuum Pressure 0.025 bar, Working Temperature -40°C to +90°C, Working Pressure 0.165 bar, Norres