M-d Building Products Gray Foam Caulk Backer Rod For Door And Window 250 Ft. L X 1/2 In.

Poly foam caulk saver acts as filler in large gaps before applying caulk. Insulates and cushions. Use in pavement cracks, wall joints and foundations. Fills large gaps and openings to prevent draftsProvides a sound surface for caulking projectsRecommended for use in expansion joints in driveways and sidewalksTwist multiple strands of cord together for extra large gaps