PB 3318525 45" 8 Double Row Stiff Nylon Main Sweeping Broom for Power Boss 72 Series Sweepers. A level, stiff Nylon filament for sweeping more stubborn debris. Designed for industrial uses as compared to the standard crimped 8DR Nylon main broom in this series. Manufactrued for use on smooth and especially irregular indoor flooring surfaces. Nylon is a longer lasting filament than polypropylene. Nylon is heat resistant and prefers dry sweeping condtions. Standard 8 Double Row Nylon Main Broom Pictrued. Fits Minuteman Power Boss 72 Series Sweepers, including SW/72 and SW/72 Deluxe. Replaces Minuteman 3318525, 318525.