said by UHF:So, you have both copper and galvanized? That's why you have leaks. Put in a dielectric union or the galvanic action will eat away the copper.
There is one, I just didn't say so. I'm using a brass union between the two. The flow path though is copper to galvanized. But that's not why there are leaks, the water is just that hard with a base PH of around 7.7, the lowest I've ever seen it here is around 7.5