It took a lot of searching to find this size! Most of the other adapters available are for the more common 15/16" size threads. I have a Price Pfister bathroom sink faucet and it has the 13/16" -27 thread size. Most stores like home depot only carry adapters for the larger kitchen sink size aerator, and the more common 15/16" bathroom sink size aerator. The difference in size between the 15/16" and 13/16" is very tiny, but they are not interchangeable. The reason I gave this 4 stars instead of 5 is because the washer supplied does not work with my sink. My particular model cannot accommodate how thick it is because the threads are not very deep on my faucet. The washer sticks out pretty far but may or may not be a problem for you depending on your particular faucet. The washer is of good quality but it is a very rigid material so can't be forced in like a softer rubber type might be able to do. I wish the faucet makers could agree on a standard size aerator and stop making proprietary designs, I need a different adapter for every sink in my house!The product did not work for me because the length of the 13/16-27 threaded end was too short to engage the threads of my faucet. Needed to request a refund.Exactly as described, but ended up using one for the shower instead because this didn't fit my sink exactly right. I think it was my sink that was weird, no problems with the adaptor. One problem was that the threads on this were not sanded off or filed down, and I cut my finger (I actually started bleeding) several times screwing it on. Be careful, the threads are very sharp.I looked at many, many sites to find this item due to it's specific size. Luckily I finally found it here. I thought a bit expensive at first but after seeing the product in person I realize it will last a lifetime.Good product works for my python water change hose to aquariumPerfect fit for my Delta faucet. Note: It did take a while to ship & arrive.best thing for my mudroom sink.It works.