How can I disconnect this brass fitting on my kitchen faucet?
The braided hose is attached to the black plastic fitting with a push-fit connector.
The locking part is inside the brass 'ferrule' on the end of the hose, and to release it you need to pull the light-grey plastic ring back in towards the ferrule (away from the black plastic fitting).
The hose should then just pop off as you're doing that.