These need to be replaced every 1-3 years depending on how often the tank is used. If you check your anode rod and notice that it's heavily corroded, then it's done its job of protecting your expensive tank, and it needs to be replaced.
The 4.5" x 1/2" NPT works with Atwood and Dometic water heaters, and the longer 9.25" x 3/4" NPT is compatible with Suburban water heaters.
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