Lock-Top II 13" x 17" Chimney Cap/damper 3/4"

The Lock-Top II comes fully assembled. Its base mounts to the included sweep's ring which attaches to the flue tile with silicone sealant (included). A 30' stainless steel cable and hardware are also included. All Lock-Top II cap/dampers have an overall height of 11-3/8". Note: Don't use Lock-Top dampers with gas logs - failure to open could cause carbon monoxide to back up into the house. In case of a gas leak, gas could be trapped in the flue, resulting in an explosion. Features: Stainless steel and cast-aluminum construction. Lifetime Warranty. Silicone rubber seals tight. Specifications: Overall Dimensions: 17" (W) x 13" (D). Fits Inside Flue Sizes: 9"x14" to 121/2"x171/2".