Trust the TOTO DuoFit In-Wall Dual Flush Tank System with WASHLET+ Auto Flush Ready
The DuoFit (WT173MA) by TOTO is a high-efficiency in-wall dual flush tank system designed for wall-hung toilets and modern concealed bathroom installations. Engineered for space-saving performance and clean design aesthetics, this system integrates a durable polyethylene in-wall tank, dual flush water-saving technology, and WASHLET+ compatibility with an auto flush-ready configuration.
With selectable flush volumes of 1.28 GPF (full flush) and 0.9 GPF (light flush), the DuoFit system helps reduce water consumption without sacrificing performance. It is commonly used in residential remodels, luxury bathrooms, commercial restrooms, and modern space-efficient design builds.
Key Features
Dual-Max Dual Flush System
The WT173MA uses TOTO’s Dual-Max flushing system, allowing users to select between a full 1.28 GPF flush for solid waste or a reduced 0.9 GPF flush for liquid waste. This helps significantly reduce overall water usage while maintaining strong, consistent bowl performance across different load conditions.
Touchless Comfort & Hands-Free Operation
This system is designed to support optional auto flush functionality when paired with compatible TOTO WASHLET units and accessories. The auto flush feature enables hands-free operation by automatically initiating a flush after use, improving hygiene and convenience in both residential and commercial applications.
Space-Saving with Structural Support
The in-wall steel carrier system is engineered to support wall-hung toilet bowls rated up to 880 lbs when properly installed. By moving the tank into the wall, the system frees up to 9 inches of visible floor space, creating a cleaner aesthetic and making floor cleaning significantly easier.
Adjustable Height and ADA Compliance
The DUOFIT system allows installation height adjustment between 15" and 19", enabling customized bowl positioning for ADA comfort, residential preference, or commercial code requirements. It also includes a pre-installed copper supply line designed for seamless WASHLET+ integration.
Since 1917, TOTO has been a global leader in bathroom innovation, known for superior quality, comfort, and design. Every Japanese toilet is crafted to elevate daily routines, delivering lasting performance and a refined, spa-like experience you'll appreciate every day.
Product Details
- Dual flushing system, low consumption (1.28 GPF/4.8 LPF & 0.9 GPF/3.4 LPF)
- Auto Flush function capability
- Adjustable 15" - 19" mounting height
- Supports up to 880 lbs
- Commercial 2" x 6" or optional residential installation with 2" x 4" wall studs with waste outlet kit
- 1-pc blow molded, insulated polyethylene tank to prevent leaks and sweating
- 2" x 6" Polyethylene outlet included
- Copper Supply Line
- One Year Limited Warranty
IMPORTANT NOTE: Push plate must be purchased separately.
INSTALLATION NOTE: Adequate structural bracing is required. Framing support should be capable of supporting 880 lbs load without damage to the wall. See installation manual for more details.
TOTO DuoFit WT173MA FAQ
What is the TOTO WT173MA DuoFit system used for?
The WT173MA is used to support wall-hung toilets with an in-wall tank system. It is designed for modern bathrooms where space-saving, clean design, and concealed plumbing are preferred.
Does the TOTO DuoFit system support auto flush?
Yes, the WT173MA is auto flush ready when paired with compatible TOTO WASHLET systems and accessories. The auto flush function enables hands-free flushing after use.
How much water does the WT173MA use per flush?
The system uses TOTO’s Dual-Max flushing technology, offering a full flush at 1.28 GPF and a reduced flush at 0.9 GPF to help conserve water.
Is this compatible with all wall-hung toilets?
No. The WT173MA is designed specifically for compatible TOTO wall-hung toilet bowls and WASHLET+ systems. Bowl and flush plate selection must match system requirements.
How much weight can the in-wall system support?
When installed correctly, the carrier system is engineered to support up to 880 lbs, making it suitable for residential and commercial use.
What is required to complete installation?
You will need a compatible wall-hung toilet bowl, a flush actuator/push plate, and (if desired) a compatible WASHLET bidet seat. These components are sold separately.
