4" PelletVent PRO, Male Flex Adapter.
This is a 4" (inside diameter) Flex Adapter, this is from the PelletVent Pro Line. It has the duralock tightening system, to get a tight fit. Use this to connect PelletVent Pro to BioFlex, when you are relining a masonry chimney. Only approved for use with BioFlex.
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