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Schaefer Brush - Double Stem/Single Spiral Flue Brush: 3-3/4" Dia, 7-1/2" OAL - 09799230 - MSC Industrial Supply
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Amazon.com: PFERD 89656 2-1/2" Double Spiral Flue Brush, 0.012 Carbon Steel, 4-1/2" Brush Part Length, 2-1/4" OD : Industrial & Scientific
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