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TOTO Duofit In-Wall Toilet Tank With Copper Supply

  • Dual-Max flushing system
  • 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


Estimated Delivery Time: 1 - 3 Days


TOTO DuoFit In-Wall toilet tank 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. This tank comes in two version. 0.9 GPF & 1.28 GPF in model WT172M or 0.9 GPF & 1.6 GPF in WT171M.

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). TOTO Duofit requires the toilet bowl and flush push plate to be purchased separately.

  • One-piece blow molded polyethylene tank to prevent leaks
  • Supports up to 880 pounds
  • Adjustable 15″-19″ mounting height
  • Copper Supply Line
  • Saves up to 9″ of floor space compared to standard floor-mounted toilet
  • Copper supply line
  • Dual-Max® dual flush system
  • Pre-plumbed for optional WASHLET® connection


You can download the installation instruction sheet here.

To find out more information about TOTO products warranty terms and conditions please click here.

For more details, please see the technical sheet below;

SKU: WT171M – WT172M      GTIN: 0739268341333






Additional information

Weight 20 kg
Dimensions 110 × 60 × 14 cm

1.28 GPF & .09 GPF, 1.6 GPF & .09 GPF



TOTO, previously known as Toyo Toki, is a Japanese multinational toilet manufacturer which is known for manufacturing the Washlet (as well as the Warmlet and similar products). TOTO was founded in 1917. The company is based in Kitakyushu, Japan, and owns production facilities in nine countries. The name "Toto" is an abbreviation of the two Japanese words forming its full name, Tōyō Tōki. Toto acquired the German toilet manufacturer Pagette in 2009 and has been supplying the European market through this company since it first appeared at the 2009 International Sanitary and Heating Fair. The company has had its European headquarters in Düsseldorf since 2012. The pre-wall specialist Tece from Emsdetten manufactures the modules for the toilets.
Toto Toilet


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