4" Universal Appliance Adaptor with Back-Flow Preventer
For some (not all) Takagi, Paloma, Rheem, Noritz tankless water heaters
This Universal Adaptor has seals on both ends and has a back-flow preventer built in
Useful in colder climates to prevent cold air from flowing back into your heat exchanger
Universal adaptor connects tankless water heater to the 4" Z-Flex Z-Vent Stainless Steel Venting
Z-Vent 2ZVB04 is an appliance adapter, which 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.