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Marine exhaust Hull Skin Fitting 30mm SMARTFIX threaded system Threaded mounting system for ease of installation - includes insulation sealing gaskets Twin skinned - designed to prevent heat transfer to hull Easy fix system - no external bolt fixings required. A perfectly clean highly-polished exterior finish for your new heater exhaust system Suitable for all heaters requiring 30mm ID exhaust including Webasto Heater HL32 Eberspacher Hydronic 10