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Dave W ... Suburban HWH have steel tanks and need the anode, thus the larger wrench size. Atwood HWH have aluminum tanks and don't need the anode rode, thus the smaller drain plug. It depends on the brand or model of RV as to which is installed, but all my HWH on my Montanas since 2000 had Suburban tanks. $$ from the supplier of either heater could change future installs.
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