I had to replace the power steering pump, belt and reservoir. I ordered a new tank but found it didn't come with the required gasket so I had to order this item which lengthened the mechanical work. A little upset but very glad I got the part to finish the job. Everything turned out great! The ring fit perfectly and did not leak. I looked everywhere for this product and ended up with the parts manufacturers who wanted it for an o-ring for $20 LOL.OMG! Thanks to the seller and Amazon I paid a lot less. This part is suitable for 2006 Mercedes Benz.