Check the listing for details. Nilfisk-Advance Advance 3800 Switch Control Board Floor Scrubber Key Tested. Condition: Used. Listed at 293.69 USD. Good used shape……. This Nilfisk-Advance Advance 3800 Switch Control Board Floor Scrubber Key is a reliable and efficient tool for cleaning and janitorial purposes. With its sturdy construction and durable materials, this unit is built to last and provide optimal performance. The model, Nilfisk-Advance HYDRO 2800-DISK, is designed to clean and buff floors with ease, leaving them looking like new. This unit is a must-have for any business or individual looking for a powerful and efficient floor scrubber. With its unit type and unit quantity of one, this item is a great addition to any cleaning arsenal. The brand, Nilfisk -Advance, is known for its quality and reliability, making this scrubber a great investment.