Z-Flex 4” Z-Vent Universal Appliance Adapter w/ Backflow Preventer

The 2ZVB04 from Z-Flex is a 4” Z-Vent Universal Appliance Adapter w/ Backflow Preventer. It 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.