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