YES all anode rods for Suburban WHs are 3/4" NPT threads (pipe thread.....tapered) and 9" or 9 1/2" long. (Aftermarket Anode Rods sold for Atwood are 1/2" dia. and NOT needed)
Are the tank threads clean...free of burrs? Cheap easy thread chaser....3/4" nipple. Screw it in using back/forth motion to chase threads/clean them up
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