This duct and flue brush has 0.075" polypropylene filament with a heavy-duty galvanized steel single spiral, double-stem. Durable brush bristles are twisted between four stem wires with two stem wires on each side. Brush diameter is 6", brush length is 6" and overall length is 9". Has male tapered pipe thread 1/4" NPT. Ideal for cleaning chimneys, flues and larger industrial air conditioning ducts.
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