Delta RP51345 works great with my Delta Leland 2575LF-RMBPU bathroom faucets (I have 3 of them). I spent a small fortune finding the right wrench for my Delta bathroom faucets. A Delta representative cannot help you if you do not know the exact faucet model. Eventually I went online and looked at each and every 4 inch center faucet and found the exact bathroom model. I then looked up the aerator part number (it's listed in the faucet specs) on the printed drawing of each part of the faucet. It's sad that there isn't another easy way to find an aerator key, but after some effort I finally found out that my aerator part was RP51345. I then looked for this aerator piece that conveniently comes with a wrench. It fits perfectly. It's a lot smaller than some of the other wrenches I've tried. One of the keys and aerator I bought matched my Delta kitchen sink so at least some of my money was well spent. At one point I got so disgusted with my faucet and couldn't find the right wrench that I almost replaced our Delta faucets to get "regular" aerators that didn't require a wrench to remove. I don't know why the builder didn't leave a wrench under the sink when the house was built (just 3 years ago). I might not have known what it was at the time, but I would have kept it in a safe place. I hope this information will help the consumer find the right wrench if suddenly your faucet has built up scale and you can't figure out how to remove the aerator.
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