I was thrilled to finally locate this difficult to find aerator for our Dornbracht bar area faucet. We were missing the aerator. It was pricy for an aerator, but I guess that’s the case with this brand. The shipping was high too. When it arrived it was missing the O-ring, so it can’t be used yet. We contacted Chicago Faucet Shoppe and was informed that we should use the O-ring from the last aerator, which we do not have (thus we bought an aerator!). They quickly referred me to the exact O-ring part number and I ordered it. Of course the shipping cost twice as much as the tiny rubber gasket. So all in all we should finally have the faucet fixed.