M-D Pro Pack Backer Rod, 1/2 in. x 250 ft., Yellow - 71551

$ 39.00

The M-D Building Products Pro Pack 1/2 in. x 250 ft. Yellow Backer Rod acts as a filler in medium gaps before applying caulk. It insulates as well as cushions. Use in pavement cracks, wall joints and foundations. Backer rod is easily trimmed to size with scissors.

Convenient Pro Packs come with an easy to dispense hole in the top of the box and ready to go handles making any large job a breeze. Color-coded by size, the backer rod has never been easier to tell apart.


  • Fills gaps and openings to prevent drafts
  • Provides a sound surface for caulking projects
  • Saves on caulk usage