This 5 lb. block of Plastic Duct Seal from GMP Tools is specifically designed to form reliable watertight and dust-proof seals around wire, cable, or conduit entrances in various closures or ducts. Its permanently pliable compound ensures that it remains flexible over time, preventing stress cracking in polyethylene and corrosion on metal surfaces. As a non-toxic sealant that adheres effectively to any clean, dry surface without shrinking, it stands out as an ideal choice for those looking to maintain the integrity of their installations. Whether used in construction or maintenance, this sealant is built to meet the demands of diverse applications in the chemical and industrial sectors.