The hose leading out of the water heater on the inside of the trailer has rusted off. My dad has in the past use epoxy putty to repair it but it has come loose again and I would like to know if and how it can be repaired. The trailer is a 1997 Savannah by Fleetwood. I do not know the brand of the water heater but the Model # is GC10A-3E the serial # is 94113014947and the spec # is 113027. I don't know what the part is called and really don't want to replace the heater. Thank you

Coming out of the back should be a 1/2" NPT short nipple, or a check valve with 1/2" NPT threads. ( NPT = National pipe thread. Just ask for a 1/2" galvanized pipe nipple the right length.(short, or 2" usually) If it's a check valve, it will usually be brass or plastic/nylon. I prefer galvanized just because the tend to hold up better. Most water lines connect to that, unless yours has a different fitting such as a female flare going to a male flare fitting in tank. Either way, you'll have to get old one out and match it, to allow for water line fitting to re-attach, or change end of water line to proper fitting to attach to nipple. Without seeing exactly what you have, I can't explain exactly what you need to do.