Product Description Seal ducts and conduit openings against dust, drafts, moisture and noise in no time with this essential compound. Non-toxic and easily "thumbed" over holes and gaps, it also protects exposed electrical raceway connections. For added peace of mind, the Gardner Bender DS-110N Duct Seal Compound 1-lb. Pug will not harden or form skin under normal conditions, so it's ready for any job whenever you are. Energy Star certification. Standard 1-year warranty included. From the Manufacturer Gardner Bender Duct Seal. Malleable non-conductive compound for sealing of electrical raceway connections from air, noise and moisture.