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Eberspacher Ducting Adaptor Reducer 75-50mm · For converting 75mm y-branch or ducting connector to accept 50mm ducting· Initial installation when air flow efficiency is paramount · To convert 75mm ID 'T' or 'Y' piece to accept 50mm ID ducting.· Efficiently distribute the flow of warm air from your heater throughout your cabin area · Use with Eberspacher or Webasto heating systems.