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Background: I just purchased a new air compressor. I was surprised to see that the collar on the quick connect coupling is retracted (I'm used to pulling the collar back to insert the male fitting), but figured that it would latch when the male fitting was placed inside.

Quick connect coupling pre-installed on compressor.

Question: When placing the appropriate-size male fitting into the quick connect, I cannot get the collar to move. The air compressor came with two of the quick connect couplings, and both have the same behavior. What am I doing wrong? Cheers.

Collar will not latch when male fitting is placed

David C
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5 Answers5

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Some female quick disconnects latch the ring back as you describe. I don't expect you have an issue with the female quick disconnect on the compressor.

I suspect that while your male fitting appears to be the right "size", it is of an incompatible type. There are many different types that appear the same when held at arms length. See this answer for a primer on the various types of quick-connects.

Community
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mac
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I was sent replacement parts. These fit and worked great. Not sure what was wrong with the other pieces...

David C
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One quick fix that worked for me is to put some oil onto the quick connect coupling, above and below the collar to try and get it to move better and snap forward. After applying the oil, I tried using a flat head screwdriver to gently push the collar forward, which did not work. But i then tried again to attach the male connector, and after trying a few times and pushing firmly, the collar snapped forward. I also noticed that it helps to make sure all air has been let out of the tank before i try connecting the coupling. This also seems to help the collar come forward and the male connector to snap in properly.

Mikey
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I have an 8 gal. Kobalt semi-portable compressor and I had the same issue. As it turns out, it's a quick-connect fitting. So, you don't have to pull it back, you just push the male end in and it locks in. Hope that helps.

ThreePhaseEel
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user130763
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I bought a new air compressor (brand: Stark) and had the same issue. There is a copper ring inside the female coupler that seems to block the balls from engaging. I almost wanted to take the copper ring out. Well, I am gad I didn't. All you need is to firmly push in the male adapter. You don't have to push back the collar on the female coupler. This could be a universal female coupler, I am guessing.

Howard
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