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 Specifications: • Vent material: AL29-4C stainless steel• Certification: Tested to meet or exceed Underwriters Laboratories (UL) spec UL1738 and ULS636• Approval: Cat II, III, IV venting• Limited Lifetime Warranty 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 American Water Heaters GT-310-P/N Indoor Liquid Propane/Natural Gas American Water Heaters GT110-P/N Indoor Liquid Propane/Natural Gas A. O. Smith ATI-510-N/P Indoor Propane/Natural GasA. O. Smith ATI-310-N/P Indoor Propane/Natural GasA. O. Smith ATI-110-N/P Indoor Propane/Natural GasGSW GSWT-110/310GSW GSWT-520/540Marey 5LMarey 10LReliance Water Heaters TS-510-GIReliance Water Heaters TS-310-GIReliance Water Heaters TS-110-GIState Industries 510 SeriesState Industries 310 Series State Industries 110 Series Takagi T-T-KJr2 Indoor Propane/NGTakagi T-K4 Indoor Propane/NG FAQ (Frequently Asked Question) Q1: Is this 4" adapter with backflow preventer available in 5" diameter, too? A1: Yes, here is the 5" version of this appliance adapter with backflow preventer. Here is an appliance adapter, backflow preventer, that also includes a condensate collector and drain if you need it for 3", 4", or 5" diameter pipe. If you do not need the drain hole, Z-Flex tech support instructs to simply plug it. And, you can also buy the Universal Appliance Adapter with no backflow preventor, and buy the backflow preventer alone here. Downloads Z-Vent SVE Series IV Installation and Maintenance Instructions, 3" to 24", Single & Double Wall Z-Vent Dimensional Specifications