Ao Smith 100112399 4 Inch Female-female Vent Adapter

Product Description

The AO SMITH 100112399 is a 4-inch female-to-female adapter designed for non-condensing T-vent systems used in tankless water heater installations. The Snap-Lock connection mechanism allows technicians to join T-vent components quickly without additional fasteners or sealants, speeding up venting assembly on the job. At 4 inches in diameter and 5 inches in length, this adapter fits standard non-condensing vent runs and transitions between T-vent sections. Licensed plumbers and water heater installers working on Takagi tankless units will find this adapter a direct-fit solution for completing or extending vent assemblies.

This adapter is used in residential and light commercial tankless water heater venting applications where non-condensing T-vent components must be joined together. It is specifically listed for use with Takagi models T-KJr2-IN, T-K4-IN, T-D2-IN, T-M32, and T-M32-ASME. Typical install scenarios include vent system assembly during new installations or replacement of damaged adapter sections during service calls on existing Takagi tankless systems.

Key Features

• Snap-Lock connection provides fast, tool-free female-to-female joint between T-vent sections
• 4-inch diameter matches standard non-condensing T-vent sizing for Takagi tankless units
• 5-inch length provides adequate clearance for joining adjacent vent components
• Non-condensing vent type — confirmed compatible with direct-vent, non-condensing Takagi models
• Female-to-female configuration allows connection of two male-ended T-vent sections

Compatibility

Designed for use with Takagi models T-KJr2-IN, T-K4-IN, T-D2-IN, T-M32, and T-M32-ASME as part of their non-condensing T-vent systems.

Installation Notes

Installation should be performed by a licensed plumber or water heater technician in accordance with local mechanical codes and the appliance manufacturer venting instructions. Shut off the water heater and allow the venting system to cool completely before disassembling or adding vent components. Verify that all Snap-Lock joints are fully seated and secure before restoring the unit to operation. Do not use this adapter in condensing vent applications or with vent pipe diameters other than 4 inches.

Technical Specifications

• Product Type: Adapter
• Vent Type: Non-Condensing
• Connection Type: Female-Female Snap-Lock
• Diameter: 4 inches
• Length: 5 inches

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112399