4" Z-Vent Universal Appliance Adapter w/ Backflow Preventer
Brand: Z-Flex
Part#: 2ZVB04
This appliance adapter connects to the 4" flue outlet of the Takagi tankless water heater and is used to adapt the unit to 4" Z-Vent pipe and venting parts. Has a built-in backflow preventer.

This adapter is required for all types of installations.
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