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Webasto or Eberspacher heater Ducting 90mm to 60mm outlet reducer · For converting 90mm internal diameter ducting fittings to accept 60mm ID air outlet · Initial installation when air flow efficiency is paramount · To convert 90mm ID 'T' or 'Y' piece to accept 60mm ID ducting. Overall depth 59mm · Efficiently distribute the flow of warm air from your heater throughout your cabin area · Use with Webasto & Eberspacher heating systems.