All of you that want to install an anode on your water heaters there are two sizes a long one and a short one, the short one is fine on any tank, the long one only fits one type of thank, should you install the long one on the wrong tank the anode will puncture the heat tube, and that means a new tank.
Before purchasing the anode measure with a chop stick how far it is before it makes contact, then purchase the anode in accordance with the length use tape and tighten enough that there are no leaks, do not over tighten!
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