Originally Posted by ogintheback
Thank you for the write up! I need to replace the top o-ring on my pump. I saw Harbor Freight has HNBR in the proper size. Would you have any reservations using the Harbor Freight o-ring?
If I put all that effort into rebuilding my own power steering pump I would not trust a HF O-Ring. I've purchased whole 500 packs of zipties that were brittle from there. Threw 488 in the trash. The first 12 broke trying to zip.
Buna N is not that expensive. Just get them from a quality hardware store.