Product Description M-D Building Products 71480 Backer Rod for Gaps & JointsM-D Building Products 71480 Backer Rod for Gaps & Joints Features: Non-absorbent, closed-cell polyethylene pre-caulking material Use before caulking to fill gaps and openings larger than 1/2" x 1/2" Prevents 3-point bonding 20' 71464: 3/8" 71680: 1/2" 71506: 5/8" From the Manufacturer Poly Foam Caulk Saver acts as a filler in large gaps before applying caulk. Insulates and cushions. Use in pavement cracks wall joints and foundations.
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