AW PERKINS Round Poly and Wire Heavy Duty 3/8" NPT Chimney Cleaning Kits MADE IN THE USA HIGHEST QUALITY

THIS IS COMMERCIAL GRADE EQUIPMENT QUALITY GUARANTEED 

To determine the size brush you need just measure the inside diameter of the pipe and select the same size brush - if your pipe has a 6" inside diameter order the 6" brush which is actually about 6 1/4" in diameter which has a slight flex assuring a correct fit for efficient cleaning. Use a poly brush for cleaning metal flues and a wire brush for cleaning masonry flues.