Hydro Pump For proper ordering, reference Hydro Gear part number stamped on hydro pump, Guaranteed quality for less, World leader in lawn and garden industry, When ordering and replacing a hydro pump, always replace the wheel motor and lines, flush the tanks and install a new oil filter. Not doing so could cause the hydro pump to fail due to contamination in the system., Proven performance using patented technology, . Fits Models: Hustler Z and Mini Z (Left hand pump) Replaces Part Numbers: Hydro Gear BDP-10A-400, Hydro Gear PG-1HQQ-DY1X-XXXX, Ariens 02964700, Hustler 781047 Stens Part Number: 025-019