
Like many others, I have a Delta Lahara sink faucet. I went to Menards and Lowes who only had a large (red) aerator key. At first I thought it was the right size (for my Delta kitchen sink) but unfortunately it's too big for the smaller aerator on the bathroom sinks. I noticed very little flow in the sink despite fresh stems and valve seals, so I figured it must be the aerator and turns out to be exactly what it was. The result of years of hard water. After removing the original aerator with the blue key I was able to clean the threads and put in the new aerator which completely solved the problem. Make sure you buy the right size aerator for your faucet model. I just want them to sell some one button aerators as I need a few more but only one button.

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