Toto CST416M Colonial White Aquia II Two Piece Elongated Dual Flush Toilet with Dual-Max 1.6 or 0.9 GPF Flush

- Item #: BCI582418

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Colonial White
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Aquia II Dual Flush Toilet

TOTO's Dual-Max flushing system offers the option of a 0.9 Gallon "light flush", or a clog free 1.6 Gallon full flush. TOTO Toilets has been showing the world how to have clog free performance for decades. While other top manufacturers have been working to improve their flush performance, TOTO Toilets have been delivering.

The TOTO Aquia II toilet appeals to designers and homeowners alike with its sleek modern lines. The TOTO CST416M also offers a skirted design for easy cleaning by removing the nooks and crannies where dust and bacteria collect, while the slender tank gives it a heightened sensibility.


  • Elongated skirted design, two piece toilet
  • Dual-Max Flushing System
  • 0.9 gallon "light flush, or a bulk removing 1.6 gallon regular flush
  • Meets and exceeds all low-flow codes and guidelines
  • Push button style flush actuation
  • Excellent rim wash
  • Large, 2-1/8" fully glazed trapway to ensure no hangups
  • 12 Inch Rough-In


  • Bowl Height: 15-3/8 inches
  • Bowl Width: 14-1/4 inches
  • Toilet Height: 30-1/4 inches
  • Toilet Width: 15-1/4 inches
  • Recommended Seat (SS114, SS154, SS204) Not Included
  • CalGreen compliant
  • Watersense Certified

Additional Toto Links

Our SKU: Toto CST416M

This product is listed under the following manufacturer number(s):

  • Toto CST416M#03
  • Toto CST416M#11
    Colonial White
  • Toto CST416M#01
  • Toto CST416M#51
  • Toto CST416M#04*
  • Toto CST416M#12
    Sedona Beige

*Denotes a finish or option that has been discontinued

Product Videos

  • How to remove and install a Toilet
    If you have been considering replacing your toilet, yet are wondering how complicated of a job this is? Take a moment and we'll show you just how simple this job can actually be.
  • TOTO Toilet Flush Testing
    Take a moment to see just how TOTO takes flush testing seriously.

Installation Resource Center

Whether you are installing the product yourself or hiring a professional, our installation Resource Center has everything you need to get your project done. Visit the Installation Resource Center to get started.

Toto CST416M Reviews

Rated 5 out of 5 by from Lean and Green The Aquia II is a compact toilet compared to the Kohler Wellworth it replaced. It is considerably shorter forward of the flange than most toilets. Mounting is rather high-tech and does not bolt directly to the flange. Rather, a mounting adapter with a rubber gasket bolts to the flange with the wax ring between it and the flange. The value here is that if the toilet has to be removed after installation you will not have to replace the wax ring ? no scraping ore yucky cleanup before replacement. Four holes must be drilled with the use of the included template at the rear to secure the two nylon mounting blocks (this may a bit of work if you have a ceramic tile floor). Once the mounting blocks are affixed to the floor the toilet can be placed and two fastening screws (with dress center taps) can be set completing the process. A word to the wise ? the Aquia requires you to work trough small ports at the back of the lower piece to affix the seat and worm the supply line (you will likely need a longer line than you now have) coming from the tank. This is best done BEFORE the toilet is put in place. As far as the operation of the toilet everything works beautifully. At the top of the tank is a split button for flushing. The left portion is designed for liquid waste, the right for #2. If you are interested in ?greenness? this is the perfect toilet. Since liquid flushes far out number solid waste flushes the total amount of water used with this toilet should be considerably less that that utilized by a 1.26 G/F toilet. At the same time the Aquia does not reduce the total water/solids ratio in the line that can lead to sewer line problems in the future.
Date published: 2009-08-31
Rated 5 out of 5 by from Nice look great value We bought this toilet for our powder room remodel last year and liked it so much we bought the same model for our master bathroom remodel. The toilet is sleek, taking up much less floor space than the original fixture, with a contemporary but still traditional look. It is easy to keep clean and the dual flush system truly does save water - and ultimately money. The recommended "soft close" lid isn't necessary but is nice to have if you want to spend the extra money.
Date published: 2011-03-23
Rated 3 out of 5 by from Mostly Thrilled PRO: style, ease of cleaning, flush power, water-saving CON: noisy peeing, skid marks, and LOUD flush (husband and I have have a rule: NO FLUSH at night) (We still would recommend TOTO. Every time we move, we replace toilets with TOTO. Nothing is better. The Drake doesn't have the same LOUD factor....but I LOVE the clean-ability of this toilet...)
Date published: 2013-11-02
Rated 5 out of 5 by from the best! best in function, best in looks--exceeds our expectations
Date published: 2010-06-19
Rated 1 out of 5 by from Dual flush is horrible I bought three of these in march of 13, after having a plumber install them, they worked for 3 months now 2 of the three toilets run non-stop. I have been trying to work with toto, but so far their recommendations have been to clean the internal cylinder, which I have done 6x and nothing ever changes. Skip this toilet if you have a choice.
Date published: 2014-01-05
Rated 3 out of 5 by from Nice look but..... The jury's still out on this one. Nice blend of modern and traditional looks and enjoy the dual push-button flush. However, toilet is leaking slowly at the base. Don't know if installation was tricky or just was not set properly. Waiting for plumber to return.
Date published: 2014-12-05

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