Hi Steve, it is important that you try your best to find out what water heater you have, because that will ultimately tell you what you need. Suburban water heaters use a steel tank, and therefore DO need and anode rod. If that is what you have, I recommend the Suburban branded anode rod to purchase and use. An Atwood brand water heater uses an aluminum tank, and therefore does not need an anode rod, so they just use a plug.
Look at your heater, then search the web. The Atwood and Suburban look different, but are the same size, if you have a typical 6 gallon like most RVs have. You could always take a photo of yours and post it too, as we could probably tell you what you have. Good luck, LTL
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2005 22' BT Cruiser 5211, Chevrolet 3500 chassis w/6.0L Vortec V-8; 6'x12' Cargo Trailer; Honda CB500X motorcycle for street and ADV riding; Yamaha TW200 motorcycle for dual-sport and trail riding...All of it for fun and adventure!
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