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4-1/2" Brush Length, 2-1/4" Diam, Double Stem, Single Spiral Flue Brush - 09799180 - MSC Industrial Supply
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Amazon.com: PFERD 89662 Maintenance Internal Cleaning Flue Brush, Carbon Steel Bristles, 3-3/4" OD, 0.012" Wire Size, 4" Size : Industrial & Scientific
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