Chuck, your water heater was probably made in Dayton, Tennessee. Assuming it is a Suburban by Airxcell, tell the RV parts department if you want aluminum, zinc or magnesium. The socket size is 1-1/16 with 3/4 pipe thread. The aluminum rod will withstand harder water better than a magnesium or zinc rod.
Edited for correction
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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