Have you tried picking one out?
Rebuild it by hucking it in the trash and buying a better fitting. I bought a bunch of the HF air fittings, and now they are all in the trash. I don't have time to constantly fix leaky air fittings.
My entire shop is plumbed with the HF quick disconnects. All leak after a while but just replace the o-ring with a good one and you are good to go.

I took it apart. There is no o-ring in this one, it has a washer. I will pick up a new one after this snowstorm passes.
I will clean it up, paying special attention to the "plunger" that rests against the washer. I did not have to take apart the end of the connecter with the snap ring. I could have just unscrewed the two parts in the back.
Here is a picture to help.
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