M-D 1 in. x 10 ft. Foam Caulk Backer Rod

The M-D 1 in. x 10 ft. Foam Caulk Backer Rod is designed to fill large gaps, joints, and openings prior to applying caulk or sealants. By providing a solid backing, it prevents excess sealant usage and ensures a uniform bead for long-lasting performance. Constructed from flexible gray foam, this backer rod easily compresses into position and works effectively with cold-applied elastomeric and silicone sealants in both interior and exterior sealing projects.