バーナードDalsin製作所810108 8インチINSULプラグブロック石造の煙突で未使用の指ぬき穴

商品説明

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 insul-plug is constructed of a ceramic based fireproof insulating material. It is 8 inches in diameter and the black outside plate covers up to a 10 inch diameter hole. Simply insert it in the old thimble opening and tighten the expansion screw on the face of the insul-plug. The sides expand and create a tight fit inside the thimble opening. It can be removed by reversing the process.