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1 Gallon Bucket of Mastic

Model: CCW-181

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Our Price: $20.04

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The 1 Gallon Bucket of Mastic is used for sealing ducts which can dramatically improve the efficiency of a heating/cooling distribution system.

Unsealed ducts typically leak about 10 to 15 percent of the conditioned air flowing through the ducts. Leaky ducts can pull unwanted air into the conditioned parts of your house and create pressure differentials within the house, exacerbating air infiltration and exfiltration problems.


Mastic is a fibrous adhesive sealant used for coating thermal insulation on pipes and ducts, and for sealing un-insulated ducts. It may be applied out of a bucket with a putty knife. The buckets are resealable, with a vapor lock seal lid. Mastic is non-toxic, non-flammable, and dries to the touch in 30 minutes.

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