259mm Outside Diameter x 250mm Inside Diameter, Specialist Woodworking & Timber Processing PU Ducting, 10 Metres, TIMBERDUC PUR 533 AS, Wall Thickness 0.7mm, Weight 2.250 Kg per Metre, Maximum Vacuum Pressure 0.045 bar, Working Temperature -40°C to +90°C, Working Pressure 0.255 bar, Norres