M-D Building Products 3/8 in. x 240 in. Interior/Exterior Gray Foam Backer Rod for Small Gaps and Joints
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The M-D Backer Rod provides a base for caulking to prevent caulk waste in deeper, larger gaps or joints. Backer rod can also fill gaps to protect the home against drafts, moisture, dust and insects. Can be used in both indoor and outdoor applications. Before installation, cut to desired length by using scissors.