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TOTO CST646CEMFGAT40#01 Aquia IV 29 5/8" One Piece Elongated Toilet with 1.28 and 0.8 GPF Dual Flush

Product Code: CST646CEMFGAT40#01


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Note: Chrome trip lever is included by default at no charge.

Select Optional Lever Finish

Note: Chrome trip lever is included by default at no charge.
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  • TOTO THU736#01-A Push Button Assembly in Cotton
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  • TOTO THU765 Auto Dual Flush Kit for 1G WASHLET+ 1.0 GPF System Toilets
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On Sale:
$702.10 $1,003.00
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About TOTO CST646CEMFGAT40#01 Aquia IV 29 5/8" One Piece Elongated Toilet with 1.28 and 0.8 GPF Dual Flush

The Aquia IV One-Piece Elongated Dual Flush 1.28 and 0.8 GPF Universal height Single Flush Ready Toilet with Cefiontect is the epitome of modern form and function. The skirted design conceals the trapway, which enhances the elegant look of the toilet and adds an additional level of sophistication. The one-piece design is not only aesthetically pleasing, but also offers the benefit of being easier to clean versus a two-piece toilet. By removing the gap between the tank and bowl, we eliminate the hiding place for dirt and debris. An additional benefit of the one-piece toilet is that there is no threat of leaks from bolts or gaskets that can occur in two-piece toilets.
  • Concealed supply connection for seamless installation
  • Dynamax Tornado flush utilizes 360 degree cleaning power to reach every part of the bowl
  • Ultra high-efficiency dual flush 1.28 and 0.8 GPF (4.8 and 3.0 LPF)
  • Cefiontect ceramic glaze prevents debris and mold from sticking to ceramic surfaces
  • Design of the bowl reduces water flow resistance resulting in a quieter flushing sound
  • Completely skirted design for a sleek and understated look that's easier to clean
  • Universal height
  • 12" Rough-in
  • Chrome push-button
  • Auto flush available as upgrade
    • Codes/Standards

      • Meets and exceeds ASME A112.19.2/CSA B45.1, ASME A112.19.14
      • Certifications: IAPMO(cUPC®), EPA WaterSense, State of Massachusetts, and others
      • Code Compliance: UPC, IPC, NSPC, NPC Canada, and others
      • Legislative Compliance: California Green Building Code, City of Los Angeles Water Efficiency Ordinance, and others
      • Complies with CA Prop 65 warning requirements

      Key Features & Innovations

      Tornado Flush Technology

      The Tornado Flush features two powerful nozzles that create a centrifugal, cyclonic rinsing action which reduces waste buildup and keeps the bowl cleaner. Using 1 gallon or 1.28 gallons per flush, this high-efficiency system is more effective in one flush than most toilets are with multiple flushes. The modern hole-free rim design means that it performs more consistently and is easy to clean.

      • Dual-nozzle water propulsion system
      • More powerful flush
      • 1 gallon or 1.28 gallon per flush
      • Cleaner bowl and less cleaning


      TOTO’s extraordinarily smooth CeFiONtect glaze prevents particulates from adhering to porous, ceramic surfaces. The ion-barrier in CeFiONtect keeps everything cleaner, longer. Less cleaning means fewer chemicals in the environment and less water used for cleaning.

      Sectional View of Barrier Density By EPMA: The surface layer that makes up the ionized barrier, seen in red is more consistent and uniform and has a higher density on the CeFiONtect surface than on the conventional surface.

      Surface View of AFM: Creating more smoothness helps minimize debris from sticking. With nothing to cling to particles can be washed away with every flash.



      Electrolyzed water is a proven disinfectant used in food preparation and cleaning. Using the incoming water supply, a pre-mist wets the toilet bowl surface aiding in the elimination of waste approximately 80% better than a dry bowl. After each flush, TOTO’s eWater+ mists the bowl with electrolyzed water, reducing the need for harsh cleaning chemicals.



      Universal Height

      Central to TOTO Total Design is taking into account people of all ages and abilities. Universal Height offers sinks and toilets at a more manageable height, making the bathroom more accessible and enjoyable for everyone. This simple design principle allows all people, from the beginning of their days through the rest of their lives, to completely enjoy their bathroom experience, regardless of age or ability.

      ADA Compliant

      The American Disability Act (ADA) was enacted in 1990 to establish design codes to serve people of all ages and abilities. A core principle behind TOTO Total Design, ADA standards consider the needs of everyone, no matter their needs, without additional adaptation or specialization, optimizing the bathroom experience for all generations in the family home.

L 29 5/8" x W 15 1/4" x H 28 3/8"

Product Specifications

Spec. Value
Toilet Type One-Piece Toilet
Seat Included No
Toilet Bowl Shape Elongated
Toilet Finish White
Flush Type Dual Flush
Toilet Style Modern
Installation Type Floor Mounted
Rough-in Size 12 in
Flush Lever Location Top
Gallons per Flush 0.8 gpf, 1.28 gpf
Toilet Length 29 5/8 in
Toilet Width 15 1/4 in
Toilet Height 28 3/8 in
Toilet Material Vitreous China
ADA Compliant Yes
High Efficiency / Eco friendly Yes
WaterSense Certified Yes
cUPC Certified Yes
Items Included Toilet Bowl, Tank
Warranty 1 Year Limited Warranty
Made In USA
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