I am not extremely familiar with the Surburban Water Heaters but after some research it appears they have a two-in-one drain valve/anode rod. Although we do not have a direct replacement for this it looks like others that were having trouble finding this either did away with the anode rod and just installed a drain valve or did away with the drain valve and installed the anode rod.
If you want to do away with the anode rod and just use a drain valve then you can obtain part # A10-4003VP... view full answer...
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