Although this is a very simple part, I do not know how to get along in a normal household without it! We have very hard water with us and often we have to clean the bubble dies, taps and descale or even exchange. For this you need these little helpers! Of course you can unscrew the aerator by means of a water pump pliers, but while they are often damaged. I had tried everything, for example, a cloth wrapped around it and then open with the pliers. But then you slipped in tight Sprudlern or hoses quickly and may scratch the whole faucet. The forceps damaged anyway mostly only paper-thin layer of chromium and then the valves are quickly rusty and unsightly! So I worried that key and have since satisfied. The bubbler or aerators are unscrewed quickly and without damage, cleaned and replaced. A star deduction is only because the service key is made of fast abnutzendem plastic. Long does not keep the part, if you're so stubborn taps, as shown below. Otherwise, I highly recommend it.
