Description
Description
The Insul-Plug blocks old, unused thimble holes in masonry chimneys. It provides a thermal break from combustibles and prevents downdrafts from entering the room. The Insu-Plug is constructed of a ceramic based fireproof insulating material and will help stop the possibility of smoke and carbon monoxide from re entering the home. The black outside plate covers up to a 10" diameter hole. Simply insert it in the old thimble opening screw on the face of the Insul-Plug. The sides expand and create a tight fit inside the thimble opening. It can always be removed by reversing the process. Also available in a 8".
Model No. 34200
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