8" Selkirk DSP Double-Wall Black Chimney Pipe Adaptor - 258240
This 8" chimney pipe adaptor works for both double or single walls, but it is compatible only with Ultra-Temp.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.