Flare ends are not hose ends. They may work, but only for a while. I've seen to many leaks at hoses put over flare ends. The suggestion I've already made was to find the right fitting. An inverted flare to hose or hose barb would be a better solution and a more lasting repair. Doing something right is not opinion. It is using tools and parts in the way that they are designed for. Just because functionality works for now does not mean it is a properly designed solution. There is a reason metric to standard, pipe to AN or inverted flare to hose exist. It is the proper design. Sure, I could probably ram a standard fitting in to a metric hole. And when I was young, I did. But I had to pay for it either with leaks or disassembly issues later.
Sure I can put a hose over a flare end. But I know that the hose will eventually crack and leak over the flare because it is stretched over its design. If you use a larger diameter hose, then the expansion and contraction of that hose will start to cut at the edge of the hose clamp. Using a barb gives more contact sealing area for the hose and using a hose end has a more gentle bubble for the hose to seal over.
