I bought this because when I looked at the brass adapter that came with my Python faucet connector I saw that it was male threaded (i.e. male thread). Since my kitchen faucet also had an external thread, I immediately came to the conclusion "that doesn't work" and bought this adapter. This adapter didn't fit my faucet either! The female side was too small for my faucet. After searching for a different adapter in hardware stores for a long time (unsuccessfully) I went back to the original (included) adapter and found that it had a FEMALE AND MALE THREAD. He brought it to the faucet, unscrewed the aerator and voila! It's wearable! Turns out I never needed that adapter. I've just come to the conclusion that the original doesn't work. You can also check your situation! 1 star off because I'm addicted. :-)
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