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The Navien 20018744B Back-Up Ring is a genuine OEM repair part made by Navien. This back-up ring is designed to fit and function properly in water heater systems, ensuring reliable performance. It comes in its original packaging and is not an aftermarket part.
This back-up ring is suitable for use in a variety of Navien water heater models, providing a precise fit for effective sealing.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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