With this offer you can complain about anything. I have already bought repeatedly from this supplier. These aerators are super in price, change in top quality and fast. The kit comes complete with sealing rings. The parts are made clean and fit perfectly. It is really worth, often to change the aerator. Also, the sealing ring is brittle over time by calcification. After changing the water flows perfectly again. And after the change you realize the difference that a hardly noticeable before.