Schaefer Brush - 3/4 Inch Inside Diameter, 15/16 Inch Actual Brush Diameter, Stainless Steel, Power Fitting and Cleaning Brush - 56489297 - MSC Industrial Supply
Schaefer Brush Part # 00648SX - Schaefer Brush Copper Tubing Cleaning Brush 3/4 In. - Abrasive Brushes - Home Depot Pro