I replaced the whole fitting with a compression fitting. Cut the fitting off and go to your local Ace or True Value, they will fix you up. No gluing or soldering etc..
Since the repair, I have decided to replace the line and all from the inside of the storage compartment and put in a chrome surface mount like the later models. I have since bought the parts but not installed them as yet. You may consider this option as I did. Everything is inside and not vulnerable to damage from something hitting it or in my case the UV sun rays just took it toll on the plastic.
Good luck with your decision. We love our 25' Sovereign
, check out my pofile pics of what I have done to the interior.