But you can use a plastic hex coupler in the tank which doesn’t appear to have failed and then any pipe connector you want. And in any case plastic/nylon is fine for domestic hot water. It’s been used for decades and you’ve almost certainly got same connecting your house faucets. It wouldn’t surprise me in the least if you just had a cheap Chinese fitting that failed for being cheap. Buy new parts at the big box store and put it back together again and you should be fine.
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