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Caulk Backer Rod, 20-Ft. x 1/2-In.

Various

1/2" x 20', Caulk Backer Rod, For Gaps & Joints, Non-Absorbant, Closed Cell Polyethylene, Pre-Caulking Material, Use Before Caulking To Fill Gaps & Openings Larger Than 1/2" x 1/2", Prevents 3 Point Bonding.