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Sika Backer Rod, Gray, Polyethylene Foam, Closed Cell Used to Partially Fill deep Cracks or Joints Before applying sealant, 3/4" Diameter x 20' Long - Walmart.com
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Foam Backer Rod for Gaps Concrete Crack Filler Joints Foam Gap Filler Caulk Saver Backing Rod Concrete Filler Rope Concrete Joint Filler (1 Inch X 10 Feet) - Amazon.com
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Amazon.com: M-D Building Products 71480 1/2-Inch by 20-Feet Backer Rod, Gray : Industrial & Scientific
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M-D Building Products 3/8 in. x 240 in. Interior/Exterior Gray Foam Backer Rod for Small Gaps and Joints 71464 - The Home Depot
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M-D 0.375-in x 350-ft Closed Cell Backer Rod, Gray in the Concrete Expansion Joints department at Lowes.com
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