PB 7857 17" Pad Driver Assembly for Minuteman Power Boss Phoenix 33 and Minuteman E33 Disc Brush Model Floor Scrubbers. A short trim poly bristle is secured in a solid plastic block. The provided pad centering device helps secure your floor pad to the block/bristles. Fits Minuteman Power Boss Phoenix 33 walk behind scrubbers. Also fits Hakomatic B70/B90, B1050/TB1230, B1100/TB1230, B310R/TB1230 (85cm Models). Listed as Pad Driver 17. Comes prepped with 18 tooth splined clutch plate. Two pad drivers required. Priced Each. Replaces Minuteman Power Boss 7857, 99785700. Our Part Number PB 7857