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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I used Z-vent back flow preventer before. However, this time to my surprise sticker on that thing that among other stuff shows flow direction was placed upside down by manufacturer. oops