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This Male Flex Adapter - 4 Inch Inside Diameter from the PelletVent Pro series is a Type L Biofuel Chimney Pipe component and consists of the duralock system for a tight seal. Use to connect BioFlex to PelletVent Pro when relining a masonry chimney. Only approved for use with BioFlex. Features: Type: Male Flex Adapter. Finish: Painted Black. Collection: PelletVent Pro. Only Approved For Use with BioFlex. UL Listed. Specifications: Overall Dimensions: 4" (H).