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The Navien gas vent cap for the NPN-U series is designed for outdoor installations. This MPN 30023991A component serves as an essential part of the venting system for tankless water heaters, ensuring proper ventilation and preventing back-drafting.
This vent cap is crucial for the functionality and safety of the tankless water heater system.
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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