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There are at least 2 different sized master caps that I know of. That is why I suggested you take what you have to an auto parts store. We have a 50% chance of telling you the correct size without know which one you have. Taking the cap in is 100%.

Take your cap to a local auto parts store and see if they have a copper ring that will fit past the threads up to the shoulder. That should stop the leak. Then, check the brass elbow on top for cracks. Replace if you find any. Install the cap, tighten down snug, not gorilla tight, install...