Description
- Makes professional joints that last
- Helps fill in and insulate large caulk joints and allows the caulking to absorb more movement
- Caulking adheres to the sides of the joint, but not to the filler rope
- Made of closed cell poly foam
- Complies with ASTM C 1330, Type C
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3/8 Inch x 230 Feet Backer Rod for Gaps & Joints
