13" X 18" 304 Stainless Steel Crown Mount Adaptor - DCMA1318
This crown mount adaptor securely clamps to the uppermost part of the chimney liner. It can increase the vertical distance among flues in multi-flue chimneys, which potentially reduces the likelihood of smoke being drawn into a downstairs flue.
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.