M-D 71464 Backer Rod, 3/8 in Dia, 20 ft L, Polyethylene, Gray

Poly foam caulk saver acts as a filler in large gaps before applying caulk

Insulates and cushions

Fills large gaps and openings to prevent drafts

Twist multiple strands of cord together for extra-large gaps, easily trimmed to size with scissors

Non-absorbent, closed-cell polyethylene pre-caulking material