Thanks for your reply bud.
Yea I checked everywhere, but this brand is called "wardflex" and tried to find a fitting to match it, can't find one. Fitting or gasket. Not sure if the fittings are cross compatible.
But I fixed the leak, not sure if temporary or not. Heres what I did:
Open fitting and ring, apply tread sealant on male treads and apply small amount on to corrugations. Press ring and seat correctly, clean excess sealant. Put corrugation back into fitting and tighten top nut only. It appears to be holding. I'm going on vacation in 2 days and I can't get a plumber out here unless it's an emergency.
So I'm just going to turn off the gas to the water heater and deal with it when I come back.
But it appears to be holding, no leaks what so ever, I checked every 30 minutes with soap and water.
I think the leak is from the bottom of the fitting as that is the part that does the sealing. If the line moves around too much, over time, I'm guessing it can scar the gasket that seals.
And my water heater uses a direct vent, with a large fan.... so I'm guessing that's what caused the scarring over time.