Z-Flex 4" Universal Appliance Adapter With Backflow Preventer
Useful in colder climates for preventing freezing air from flowing back into the heat exchanger and freezing it and damaging the heater
• Vent material: AL29-4C stainless steel
Compatibility and cross reference:
This item is the same as Takagi, AO Smith, American Heating part number 9007996005.
It is compatible with the following tankless water heaters, as shown in their manual:
American Water Heaters GT-510-P/N Indoor Liquid Propane/Natural Gas
FAQ (Frequently Asked Question)
Q1: Is this 4" adapter with backflow preventer available in 3" or 5" diameter, too?
A1. We have something very similar here. That includes the condensation drain. If you do not need the drain hole, Z-Flex tech support instructs to simply plug it. Z-Flex does not make a 5" UAA with a backflow preventer and without a condensate drain. And, you can also buy the Universal Appliance Adapter with no backflow preventor, and buy the backflow preventer alone here: