23406 Worcester Poly Round 7" Brush
Use this Poly Brush on coal, gas, and oil flues. The acids in such flues deteriorate steel bristles. The special .075" stiff black polypropylene bristles resist these acids for long life.
Brush has a 3/4" loop on one end and a 3/8" NPT on the other. It attaches directly to the 3/8" fiberglass rods.