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Dampers & Chimney Caps > Dampers > Lock-Top Dampers Products - Lock-Top Dampers 13" X 13" Lock-Top By Gelco Other Sizes: -- Choose a size -- 13" X 13" Lock-Top 13" X 17" Lock-Top 17" X 17" Lock-Top 8" X 13" Lock-Top 8" X 17" Lock-Top 8" X 8" Lock-Top (13" X 13" pictured)