Isodec thermally insulated Ø200 mm ventilation hose (10 metres)
Consideration for Hose Insulation | Swagelok
Ortolc ID 6-50mm Pipe Insulation Tubing Heat Preservation Insulated for Air Conditioning and Hot Water Heater, 15mm Thick Foam Hose (Size : 25mm/1in) : Amazon.co.uk: DIY & Tools