I'm trying to replace a leaking kitchen faucet supply line. The connection to the faucet is not one I have seen before. See picture. How do I disconnect this old one? It looks like it either screws on (female) or in (male), but which is it? It doesn't look like it snaps on or is sweated on.
What you are showing are integral parts of the faucet. On the ends of two of these are the water supply connections and the third one connects to the spout which appears to be extendable.
If these are leaking you probably cannot change them as they are usually crimped to the valve assembly up inside the faucet.
It's time to get a new one.