It sounds like you are trying to disconnect a quick-connect fitting. Don't loosen the hex. No tools required. Just pull back a bit harder on the outer brass ring then pull out the male end of the fitting. You might have to push it, then pull it. A word of caution- if the male end is on a hose that has air pressure in it, it's going to very rapidly escape from the hose. If you aren't prepared for that it will startle you and you could hurt yourself. Just hold on to it securely and don't put your face too close. Good luck, Al K
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