This duct and flue brush has 0.023" tempered carbon steel wire with a heavy-duty galvanized steel double spiral, double-stem. Brush bristles are twisted between four stems of wire with two layers of bristles for added strength. Each layer is perpendicular to the other with a single stem wire in each quadrant. Brush diameter is 7", brush length is 4.5" and overall length is 7". Has male tapered pipe thread 1/4" NPT. Ideal for cleaning chimneys and larger industrial air conditioning ducts.
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