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An asbestos-free, all-purpose, non-hardening, sealing compound. For sealing electrical conduit openings against drafts, dust, moisture, and noise. Non-combustible, non-conducting, dark gray, dough-like mastic that is molded by hand. Adheres to painted surfaces, wood, metal, glass, rubber, and plastic. Non-toxic and non-staining. Plug size 1 lb.