I had to drill out the rubber blocking the side stem tube of the excess rubber from the mold it was made from but works fantastic. The old one had harden to like a brittle plastic but made from rubber because it was over 20 years old but this one does the trick really well. Don’t be afraid to buy this one vs the $80 part from Mercedes Benz. The seller has been great to talk to once he understood the issue. I just had to give him 5 stars. 🤙🏻