Selkirk 8 in. D Galvanized Steel Wall Thimble

The insulated wall thimble installs quickly and eliminates the need for using individual fire stops. Interior plate has black matte finish. The round shielding acts as a radiation shield and provides the required 2 inch airspace clearance to combustibles. Assembled with the positive joint coupler, the safest and most secure locking system in the industry, ultra-temp and galva-temp chimney sections twist together with a 1/8 turn A locking band ensures system integrity and strength for the life of the chimney This superior insulation maintains higher internal flue temperatures, enhancing draft and efficiency