3" Olympia New Universal Components 18-Gauge 18" X 18" Top/Bottom Plate - TPRGD3-1818
This top and bottom plate set serves two main purposes: the top plate can be used for sealing the top of the liner to the flue, while the bottom plate is to provide additional support for a more secure connection. These Universal Components fit all the leading flexible liner brands.
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.