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Nu-Calgon's Caulking Cord White is a self-adhesive sealing and caulking cord designed for HVAC applications. Its water- and vapor-proof properties make it ideal for sealing joints, plugging holes, cracks, and other voids to ensure efficient operation. The odorless cords can be used indoors or out, providing flexibility for a variety of applications. With its easy-to-apply feature requiring no tools, this caulking cord is the perfect solution for any DIY project or professional application. Save time and money while ensuring quality results with Nu-Calgon's Caulking Cord White.