AD 56453503 10" Diameter Rear Wheel for Advance 5000 Riding Floor Scrubbers. A solid treaded wheel. Fits Nilfisk-Advance Hydro-Retriever 5000 models (P, B). Two rear wheels are required per unit (For the front wheels, use 56453458 Tire and 56453405 14" Wheel Assembly). Priced per wheel. Replaces Nilfisk-Advance 56453503, 453503. Our Part Number AD 56453503