MetalBestos 8FC Finish Collar for 8" chimney pipe that is supported in the attic or on the roof with RSP or 8SC-18 so that pipe extends into the room. This Finish Collar connects selkirk metal bestos (also know known as MetalBest) piping to interior double wall or single wall pipe.Other parts you may need include the 8t-dsac  and the 8t-dsa