Frost King Caulk Saver

Frost King Caulk Saver reduces the amount of caulk you need to fill or seal large openings. Made of durable, resilient poly foam, it works with virtually every type of caulk and sealant. Designed for use behind caulks to fill wide cracks, reducing the amount of caulk needed. Made of polyethylene vinyl material for durability and longevity – this 3/8-inch wide caulk filler is a suitable choice to fill 3/8-inch or smaller gaps.