Product Knowledgebase and FAQs
| Word | Description |
| 2ZVB04 | Z-Vent's part number for an Appliance Adapter with a built in Backflow. Required on Takagi Tankless water heaters installed in areas of the country where the temperature can get to freezing or below. This will minimize the chance of the heat exchanger from freezing.Replaces the Takagi TK-TV03 |