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Model # CST416M01

Internet # 203759613

Aquia II 2-piece 1.6 GPF or 0.9 GPF Dual Flush Elongated Toilet in Cotton - No Seat

This item has been discontinued.
The Home Depot no longer carries this specific product.

$343.08 /each

  • Toilet seat sold separately


Model # CST416M01

Internet # 203759613

Toto's Dual-Max flushing system, found on several of our most popular High Efficiency Toilets, offers the option of a 1.6 GPF or 0.9 GPF based upon need. Exceptional water savings paired with outstanding performance -- that's Dual-Max. Skirted design facilitates easy cleaning.

  • Seat not included
  • WaterSense certified
  • Elongated skirted design, two piece toilet
  • Dual-max flushing system
  • Push button style flush option
  • Upgrade with an oval SoftClose seat
  • Large, 2-1/8 in. fully glazed trap-way
  • CalGreen compliant


Bowl Height (in.) 
Flush Valve Size (in.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Bowl Height 
Bowl Shape 
Color Family 
Commercial / Residential 
Flushing Mechanism 
Assisted Flush 
Flushing Technology 
Dual Flush 
Flushing Type 
Dual Flush 
Gallons Per Flush 
MaP Performance Rating 
Not Rated 
Vitreous China 
Mount Location 
Floor Mount 
Product Weight (lb.) 
96.5 lb 
Rough In Size 
Toilet Features 
Complete Kit 
Toilet Included Components 
No Addional Items Included 
Trip Lever Location 
Warranty / Certifications
Certifications and Listings 
No Certifications or Listings 
Manufacturer Warranty 
1 year 


Rated 4.3 out of 5 by 42 reviewers.
Rated 1.0 out of 5.0 by Terrible toilet. It just doesn't flush "number 2". It often requires 3 full flushes to get the toilet paper down (and no we're not loading it with toilet paper). For this much money it should actually work. The other problem is that it gets dirty all the time. The water is so low that your excrement, the website wouldn't let me use the word p00p, seriously, basically stains the sides of the bowl and you have to wipe it by hand. TERRIBLE TERRIBLE DESIGN. Clearly Toto didn't bother testing it before they produced it. June 14, 2015
Rated 4.0 out of 5.0 by Great purchase:) Looks beautiful, does not come with a seat. Taller seat than normal. Need to purchase separate from Toto, so it is not convenient. Installation it's OK. December 17, 2014
Rated 5.0 out of 5.0 by Excellent toilet with great value- but a couple of caveats!! This is a terrific toilet. It's fairly easy to install, high-quality, looks good, and a very good value for the price. I love the dual-flush capability and low-flow. Flushing power is terrific, and #2 flush is hardly even needed! But there are a couple of things you need to be aware of if you're considering buying this model. While installation is pretty straightforward for a toilet, it requires a small adapter over the wax ring that gets bolted to the flange. The toilet itself is secured by its weight on this adapter, and two small blocks screwed into the floor, between flange and wall. No big deal for most installations, but might cause a slight issue with some floors. Also, the water supply line connect to the tank THROUGH the rear of the bowl unit. You may need a longer supply line in some cases. But my biggest headache has actually been finding the right SEAT!! There is no access to the seat mounting bolts from below (they are internal), so only seats with external hinges can be used. I've had a lot of trouble finding one that I like that can be mounted on May 19, 2013
Rated 5.0 out of 5.0 by Best Seat in the House With the severe drought in California -- every little bit helps. This toilet is not only a major water saver with the dual flush function but it looks great and works very, very well. The seat, seat height and functions literally make this the best seat in the house. July 17, 2015
Rated 4.0 out of 5.0 by Very Nice Toilet but the Instructions are Less than Adequate Thankfully, my husband has worked as a plumber's apprentice. This toilet is quite a bit more difficult to install than a standard toilet, particularly if you have to drill into concrete. The instructions leave out important information that we were able to trackdown on line. Even the parts list was sketchy and not very detailed. September 2, 2014
Rated 4.0 out of 5.0 by Great flush, good quality but not an easy install 1st toilet arrived damaged "expedited" 2nd toilet came only 1 day earlier than std delivery (not happy, but HD gave me a small gift card... Paid for seat so ok). My husband installed and it took him 3 days, mostly b/c of getting the right drill bit for the tile. He is a DIY and good so just beware, the install is not like normal non-skirted toilets but it's not impossible either. He has already started on the 2nd install and it will only take 1 day. We have 2 kids, 8 and 10, and I was worried about the cleaning. We've had for a week and no issues whatsoever. #1 flush covers it fine with 1 flush. And I don't need to hold down the button, just a good firm press and you're off. #2 is very powerful. Much better toilet than our original 1950s ones we replaced. This is a little pricey but worth it. And the slow close seat is a no brainer, esp with kids. August 4, 2013
Rated 5.0 out of 5.0 by Eccellent Toilet BOWL -- Strontly Recommended After the first one arrived to my home broken and the second one arrived to store broke as well I was thinking about moving to a different style. However, Home Depot convinced me that they will take every extra caution required to get the third one as expected and I decided to go for it. I just installed it last night and I can not be happier. It looks excellent -- much better than when I saw it at the showroom. It works perfect as well. It was little more difficult to install compared to standard design as I had difficulties drilling into tile, but once that was done everything went smooth. I really recommend this product and will put two more as soon as I decide to work on my remaining bathrooms. August 30, 2014
Rated 5.0 out of 5.0 by Best purchase Installation guide is confusing, pictures are small and no details. But after we google it and thanks some people put detailed pictures, it's really easy to install. I wish company will make more understandable manual with more pictures. Overall it's a great toilet, looks so modern and flashes very well!!! June 23, 2015
  • 2015-08-02T12:00:27.884-05:00
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