Sashco 30110 5/8" x 20' Filler Rope

Filler rope is soft and pliable so it fits into the joint easily. Unlike open cell backer rod, it repels water to help protect that joint from damage. Fills the joint so you use less caulk. Fully compatible with all substrates and sealants. Use in any caulking joint 1/2" deep or more.