3" Olympia New Universal Components 18-Gauge 13" x 18" No Sag/No Leak Flat Top Plate - TPNS3-1318
This top plate is used to secure a flexible chimney liner from the top of the chimney and ensure a tight seal without any sagging or leaks. 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.