TOTO WT172M DuoFit In-Wall Toi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$673.07
TOTO WT172M DuoFit In-Wall Toilet Tank with Dual-Max Dual-Flush 1.28 and 0.9 GPF System with Copper Supply

TOTO WT172M DuoFit In-Wall Toilet Tank with Dual-Max Dual-Flush 1.28 and 0.9 GPF System with Copper Supply

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Model: WT172M
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$673.07
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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. The toilet mounting height is adjustable from 15 to 19 inches and can support up to 880 pounds. 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 (THU468). This DUOFIT requires the toilet bowl and flush push plate to be purchased separately.
  • Dual-Max dual flush 1.28 and 0.9 GPF flushing system
  • Copper supply line
  • Saves up to 9" of floor space compared to standard floor-mounted toilet
  • Adjustable 15"-19" mounting height
  • Supports up to 880 pounds

 

Manufacturer Resources:

Specification Sheet

Parts Manual

Installation Manual

Manufacturer Resources

Spec Sheet

Product Specs

Product Group:
Washroom/Bath Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Wall-Hung Toilets
Mounting Method:
Wall Mount/Back Outlet
Product Material:
Steel|Plastic
Department:
Plumbing
Parts and Accessories Type:
Toilet
Application:
Toilet

TOTO WT172M – Frequently Asked Questions

1) Does the TOTO WT172M DuoFit in-wall tank come with the toilet bowl and flush plate?
No. The WT172M is the in-wall carrier and tank only. The bowl and the flush push plate are both separate purchases, so a complete wall-hung installation needs three orders, not one. Budget and schedule the job accordingly, because a carrier with no bowl and no actuator plate is not a finished fixture.
2) Will the TOTO DuoFit WT172M fit in a 2x4 stud wall?
Not as shipped. The WT172M kit arrives ready for a 2x6 stud setting with a 2 x 6 polyethylene waste outlet. To frame it into a 2x4 wall you have to add TOTO's 2x4 PVC outlet kit, part THU343. Confirm your wall depth before rough-in, because the outlet kit is the difference between the carrier fitting the framing and the wall having to be furred out.
3) What bowl height can I set with the DuoFit in-wall carrier?
The DuoFit harness adjusts the toilet mounting height anywhere from 15 to 19 inches, set at rough-in. That range lets you land on a comfort height for taller users or an accessible seat height for a facility, and it is why a single carrier model can serve different rooms in the same building. Once the wall is closed the height is fixed, so decide it at framing.
4) Can I add a WASHLET bidet seat to a WT172M in-wall tank later?
Yes, and the carrier is already prepped for it. A copper supply line is built into the WT172M and pre-attached, so you are not opening a finished wall to run water to the seat. To finish the connection you order TOTO's WASHLET connection kit, THU468. Roughing in the WT172M now keeps the bidet option open even if the seat comes years after the remodel.
5) Is the DuoFit in-wall tank a back outlet or floor outlet toilet?
Wall mount with a back outlet. The bowl hangs off the carrier and the waste exits horizontally into the wall rather than down through the floor, which is what frees the floor under the fixture. If your existing rough-in is a floor flange, converting to the WT172M means new drain work inside the wall, not just a fixture swap.
6) What are the flush volumes on the TOTO Dual-Max dual-flush in-wall tank?
Two volumes: 0.9 GPF for the light flush and 1.28 GPF for solids. The 1.28 setting is what most water-conserving jurisdictions and green building programs are written around, and the 0.9 rinse pulls the effective average below that in real use. For a property manager metering water across a portfolio, the dual-flush behavior is where the savings actually show up.
7) How much floor space does a wall-hung toilet with an in-wall tank actually save?
About 9 inches compared with a standard floor-mounted toilet, because the tank lives inside the stud bay instead of behind the bowl. In a tight half bath or a compact commercial stall that is often the difference between a door that swings and one that does not, and the open floor under the bowl makes mopping a whole lot quicker in a high-traffic restroom.
8) Should I order an in-wall tank or a standard two-piece toilet for a small commercial restroom?
Go in-wall when floor area or cleaning time is the constraint. The DuoFit puts the tank in the wall, saves roughly 9 inches of depth, and leaves the floor clear under the bowl. The trade-off is real: it needs a 2x6 stud bay (or the THU343 kit for 2x4), back outlet drain in the wall, and the bowl and flush plate bought separately. A floor-mounted toilet is the simpler order and the simpler rough-in. If the wall is already open and the drain can go horizontal, in-wall wins on space and maintenance.
9) What is the TOTO WT172M carrier frame made of?
Steel and plastic. The steel frame carries the bowl load and anchors to the framing and floor, while the tank and waste components are molded plastic. Once the wall is closed, everything but the actuator plate is concealed, so the serviceable items are reached through the flush plate opening.
How fast can I get the TOTO WT172M 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 WT172M come with a warranty?
Absolutely. The TOTO WT172M 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 WT172M?
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 WT172M from ZenSupply?
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