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Webasto and Eberspacher Heater 50mm Warm Air Ducting Please note: Cut to length. Order 3 x 1 metre lengths and receive 1 x 3 metre length. Up to 20 metres. High quality 50mm internal diameter pliable APK ducting, for professional use High Quality APK ducting for boat, RV motorhome installations Available in cut to order lengths - 1 metre multiples Approved for Eberspacher Heaters Approved for Webasto Heaters Can be shaped by hand to a minimum internal radius of 3 x diameter (150mm) Maximum uncut length from stock 20 metres. APK material for ducting is an industry standard. A - Inner layer - Aluminium heat reflective P - Centre layer - Paper (flexible cardboard) K - Outer layer - Plastic (Kunststoff)