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Webasto Heater 60mm internal diameter warm air ducting - 1 metre fixed length Crush Resistant High Quality APK ducting for boat, RV motorhome installations Approved for Eberspacher & Webasto Heaters High quality 60mm internal diameter flexible APK ducting, for professional use APK material for ducting is an industry standard. P - Inner layer - Paper (flexible cardboard) A - Centre Layer - Aluminium heat reflective K - Outer layer - Plastic (Kunststoff) Please Note: 100cm fixed length. If you order more than one you will receive multiple cut lengths. If you require a single length of one metre or more please see 60 mm warm air ducting.