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Webasto and Eberspacher Heater 90mm internal diameter warm air ducting - 50cm fixed length High Quality APK ducting for boat, RV motorhome installations Approved for Eberspacher & Webasto Heaters High quality 90mm internal diameter flexible APK ducting, for professional use 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) Please Note: 50cm fixed length. If you order more than one you will receive multiple cut lengths.