BLUE NYLON BRUSHES ARE RECOMMENDED FOR REMOVING SOFT DEPOSITS SUCH AS MUD AND ALGAE FROM BOTH STRAIGHT FERROUS AND NONFERROUS TUBES. TUBE-CLEANING NYLON BRUSHES ARE MADE FROM THE HIGHEST QUALITY COMPONENTS WITH STRICT ENGINEERING TOLERANCES DESIGNED TO DELIVER THE DESIRED RESULTS. FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" HIGH-QUALITY NYLON BRUSH TECHNOLOGY EXCLUSIVE X-FILAMENT TECHNOLOGY IMPROVES SURFACE CLEANING DURABLE AND LONG-LASTING BRUSH SHOULD BE EQUAL TO OR 1/16"" (1-5/8MM) SMALLER THAN TUBE I.D. NOTE QUICK CONNECT FITTING IN 7/16"" (11-1/8MM) TO 1""(25-3/8MM) ONLY