Early (30's) Ford V8's used a fitting that was used in a radiator hose. . As far as I know, these are still available and may be an option. Sorry, but I don't know the year/application.
Did a quick search and came up with this" Dennis Carpenter - Hot Water Heater Hose Fitting, part # 91A-15160-A
Used in 39-56 Ford Trucks, 39-48 cars.
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ