RS adaptors are not for use with air-insulated factory-built chimneys. We can have an adaptor custom fabricated forair-insulated chimneys. Note: 8" x 8" Lock-Top damper required. Features: Type: RS Adaptor. Shape: Round Square. For use with round flue tiles. Specifications: Fits Round Flue Size: 7.5".
Item# : SPM8158124302
Model # : 9413