Review on 5-inch Threaded Commercial Cleaning Scrub Brush for Electric, Pneumatic DA Rotary Polishers - Ideal for Bathroom Rugs, Carpet, Floors, Showers, and Grout by Corina Doepke

I have a Porter 7336 cord. I saw another review where someone said it didn't fit their model. I took my time and slowly screwed it into the buffer/grinder. At first I thought it didn't fit, but after trying again I found it was twisted correctly. In any case, it did a great job on my very dirty tile/grout. So much so that I no longer have to touch up the seams as planned. I highly recommend this brush.