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Do it Poly Foam Caulk Saver Backer Rod
Resilient poly foam provides efficient fill or seal for large openings. Moisture-resistant, saves on expensive caulks and sealants, lasts for years. Use to fill cement cracks, meeting joints, aluminum siding panels, door and window frames. Seals foundation bases, too.
An EnviroLINK Product: This product meets the standards for energy efficiency and reduced impact on the environment.