Ao Smith 100112416 Backflow Preventer Adapter 4 in

Product Description

The AO SMITH 100112416 is a 4-inch backflow preventer and female-to-female adapter designed for non-condensing concentric vent systems. It blocks cold outside air from entering the vent pipe, preventing the heat exchanger from freezing during low-demand or off-cycle conditions. This component is installed at the termination or transition point of a concentric vent assembly and is typically handled by a licensed HVAC technician during new installation or service of a water heater or furnace venting system.

This adapter is suited for non-condensing appliances vented through concentric pipe systems, where a single penetration carries both combustion air intake and exhaust. The 4-inch diameter fits standard concentric vent terminations used in residential and light commercial water heater installations. It serves both as a backflow prevention device and a fitting adapter, reducing the need for additional transition components in the vent run.

Key Features

• Prevents cold air backflow into the vent, protecting the heat exchanger from freeze damage
• 4-inch diameter fits standard non-condensing concentric vent assemblies
• Female-to-female adapter design simplifies vent termination connections
• Compatible with non-condensing concentric vent configurations
• Dual function: backflow prevention and pipe adapter in a single component

Compatibility

Designed as an OEM-style replacement adapter for non-condensing concentric vent systems requiring a 4-inch backflow preventer and female-to-female connection.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber familiar with venting codes such as the IFGC and local mechanical codes. Shut off the appliance and allow all components to cool before disassembling any vent sections. Ensure the adapter is fully seated and secured according to the vent manufacturer's joining requirements. Do not operate the appliance with an incomplete or improperly sealed vent assembly.

Technical Specifications

• Product Type: Backflow Preventer Adapter
• Diameter: 4 inches
• Vent Type: Non-Condensing
• Vent Configuration: Concentric

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112416