BACKER ROD 3/8 LNFT "
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<p>Standard Backer Rod is an extruded closed cell, round polyethylene foam material with skin-like texture. Compatible with with butyl, polysulfide, acrylic, polyurethane, silicone and most cold sealants.</p> <p>Helps prevent clogging of expansion joint with mortar and is the accepted material for brick and block expansion joint fillers.</p>