MD Building Foam Backer Rod, Gray, 3/8in x 20ft for Small Gaps

Customers find the backer rod to be a high-quality product that works well for various applications, including expansion joints and threshold gaps. The product receives positive feedback for its fit and versatility, with one customer noting it's particularly useful for vacuum boards. The size and adhesion receive mixed reviews, with several customers noting it's smaller than advertised and one mentioning it pops open under stress. The product description receives criticism for being misleading.