Replaced my leaking water heater expansion tank last December (new one, $30 at Lowe’s). It was fourteen years old. It had a sticker on it saying “This device will leak. Replace when seven years old.”
BTW … part of the procedure to install a new expansion tank of to pre-pressurize it with air to your water pressure. I read my water pressure with a test gauge. It was 65 psi.
Note that I did not replace my 14-year-old water heater. Will put that on my ToDo list.
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