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Backer Rod 3/8 Per Foot
Backer Rod 3/8 Per Foot

Round, firm, resilient, polyethylene extruded closed celled foam with a water resistant outer skin. 
Provides controlled depth for sealants.
Compresses up to 50% in smaller sizes and 30% in large sizes.
Does not stick to sealants. Exceeds ASTM standards for bond breakering materials. No bond breaker is required.
Very high moisture resistance. Will not absorb ground water.
Compatible with all know types of sealants including butyl, polyurethane, silicones, tri-polyimer, polysulfide, acrylic, etc.