TOTO WT173M DUOFIT In-Wall Dua...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$732.86
TOTO WT173M DUOFIT In-Wall Dual Flush 1.28 and 0.9 GPF Tank System Copper Supply Line

TOTO WT173M DUOFIT In-Wall Dual Flush 1.28 and 0.9 GPF Tank System Copper Supply Line

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Model: WT173M
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$732.86
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The TOTO DuoFit In-Wall Tank Dual-Flush System with Copper Supply takes up less floor space, giving your bathroom a more open feel and making it easier to clean. This modern design uses TOTO's Dual-Max flushing system, allowing you to proactively conserve water with a full or light flush option. Choose between a 0.9 GPF rinse or 1.28 GPF for tougher jobs. The DUOFIT harness allows you to select a mounting height of 15 to 19 inches. This provides the opportunity for you to establish a comfortable bowl height for a wide array of individuals. The in-wall unit can support up to 880lbs when installed properly. The kit arrives ready to be installed within a 2” x 6” stud setting with a 2" x 6" polyethylene waste outlet. If you require installation within a 2” x 4” setting, you will need to additionally purchase TOTO's 2” x 4” PVC outlet kit (THU343). To enhance the installation with a WASHLET bidet seat, there is a pre-attached copper supply built into the system. The separately sold TOTO WASHLET Connection kit will complete your WASHLET install (THU805). This DUOFIT requires the toilet bowl and push plate to be purchased separately.
  • High-Efficiency DYNAMAX TORNADO dual flushing system
  • Dual-Max flush promotes water conservation with a 0.9 or 1.28 GPF option
  • Copper supply line
  • Saves up to 9" of floor space compared to standard floor-mounted toilet
  • Adjustable 15"-19" mounting height

 

Manufacturer Resources:

Specification Sheet

Manufacturer Resources

Spec Sheet

Product Specs

Product Group:
Washroom/Bath Accessories
Product Subgroup:
Parts and Accessories
Flush lever Location:
Wall Push Button
Product Type:
Wall-Hung Toilets
WaterSense:
Yes
Gallons Per Flush (GPF):
1.28|0.9
Mounting Method:
Wall Mount/Back Outlet
Product Material:
Steel|Plastic
Department:
Plumbing
Parts and Accessories Type:
Toilet
Application:
Toilet

TOTO WT173M – Frequently Asked Questions

1) Does the TOTO WT173M DUOFIT in-wall tank come with the toilet bowl and flush plate?
No. The WT173M is the in-wall carrier and tank only. The bowl and the push plate are both separate purchases, so a complete wall-hung installation needs three orders: the DUOFIT tank system, a compatible TOTO wall-hung bowl, and the push plate that actuates the dual flush. Budget and schedule the job accordingly, because the plate is what the finished wall shows and it is not in the box.
2) Will the TOTO DUOFIT WT173M fit in a 2x4 stud wall?
Not as it ships. The kit arrives set up for a 2x6 stud cavity with a 2 x 6 polyethylene waste outlet. For a 2x4 wall you have to add TOTO's 2x4 PVC outlet kit, part THU343. If you are framing new, a 2x6 chase is the simpler path; on a remodel into existing 2x4 partitions, order the THU343 with the tank.
3) How high can you set the bowl on a TOTO DUOFIT in-wall carrier?
The DUOFIT harness adjusts the mounting height from 15 to 19 inches, so the finished bowl rim height is set during rough-in rather than fixed by the bowl. That range lets you land a comfort-height seat for adult users in a commercial washroom or drop lower for a child-height fixture in a school. Decide the height before the wall closes; after tile, it is not adjustable.
4) Can I add a TOTO WASHLET bidet seat to the DUOFIT WT173M later?
Yes, and the groundwork is already there. The WT173M has a copper supply line pre-attached inside the system specifically to feed a WASHLET. To finish that connection you add TOTO's WASHLET connection kit, THU805. Running it now costs nothing extra in labor; adding it after the wall is closed means opening the wall.
5) How does the TOTO DUOFIT WT173M connect to the drain?
It is a back-outlet, wall-mount system: the bowl hangs off the carrier and the waste exits horizontally into the wall through the supplied 2" x 6" polyethylene outlet, not down through the floor. If your rough plumbing is a floor flange, this is not a drop-in swap, you are re-routing the drain into the wall.
6) What are the flush volumes on the TOTO DUOFIT dual flush tank, and is it WaterSense?
Two volumes: 0.9 GPF for liquid waste and 1.28 GPF for solids, selected at the wall push button. The system is WaterSense listed. For a government, healthcare, or multi-family spec that calls for a high-efficiency fixture, the 1.28 full flush is the number that gets cited, and the 0.9 light flush pulls the effective average below it.
7) Should I use an in-wall tank system or a standard floor-mounted toilet?
An in-wall carrier like the DUOFIT hides the tank in the stud cavity and saves up to 9 inches of floor space against a standard floor-mounted toilet, and it leaves clear floor under the bowl for mopping, which is why it shows up in small commercial washrooms and hospitality baths. The trade is access and framing: it wants a 2x6 chase, the height is set at rough-in, and the bowl and push plate are ordered separately. A floor-mounted toilet is the simpler retrofit when you are replacing one fixture in a finished room and cannot open the wall.
8) What is the exact part number for the TOTO in-wall dual flush tank with copper supply?
TOTO WT173M, the DUOFIT in-wall dual flush tank system with the copper supply line already run for a WASHLET. Note the distinction when ordering: the copper-supply version is what lets you add a bidet seat without opening the wall later, and the 2x4 outlet kit (THU343) and WASHLET connection kit (THU805) are the two accessories most often ordered alongside it.
9) What is the TOTO DUOFIT carrier frame made of?
Steel and plastic: a steel frame carries the 880 lb load into the structure, with the tank and waste components in plastic. That is the reason the assembly can be buried in a wall and still take the load a wall-hung bowl puts on it.
How fast can I get the TOTO WT173M delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the TOTO WT173M come with a warranty?
Absolutely. The TOTO WT173M is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the TOTO WT173M?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the TOTO WT173M from ZenSupply?
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