This part is listed by BMW as BMW part number 32412228873 and is described as Power Steering Hose - E39 M5 - 32412228873 - Rein.
This hose supplies the power steering pump with fluid from the reservoir. BMW calls it an "intake manifold" or "suction pipe". The hose can also swell over time, causing a leak, and the hose must be replaced. A crimped hose clamp was originally used but this can expand and cause an PS fluid leak as well. We recommend a 18-24mm premium hose clamp instead.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
5 Series
E39 (97-03) > M5 (00-03)