Rectorseal 81880 1Pound Duct Seal Compound

Product Description RectorSeal Duct Seal Compound is a gray, permanently soft, non-toxic, putty type compound which adheres to most clean, dry surfaces. It is designed to be used when sealing around the ends of electrical conduit and boxes. 10-Pound. From the Manufacturer RectorSeal Duct Seal Compound is a gray, permanently soft, non-toxic, putty type compound which adheres to most clean, dry surfaces. It is designed to be used when sealing around the ends of electrical conduit and boxes. 10-Pound.