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Ultramax Toilet Repair Parts
by Toto


Toto Ultramax ToiletUltramax & Eco Ultramax
Toto Ultramax II ToiletUltramax II

Replacement Parts for Toto Ultramax & Eco Ultramax Toilets
One Piece Model #MS853113S or #MS853113E (round), #MS854114S or MS854114E(G)(elongated)
Tank #CST853S or #CST854S G-Max Flushing System 1.6 gpf
Tank #CST853E or #CST854E(L)(G) E-Max Flushing System 1.28 gpf

Parts diagram for Ultramax one-piece toilets

Item # Part # Description Price & Quantity
1 TSU99A.X Fill Valve - Replaces TSU08A.11, TSU18A, TSU29A, & TSU36A.10
- for 1.6 gpf set height of TSU99A.X to notch 10 - refill ratio 4
-  for 1.28 gpf set height of TSU99A.X to notch 9 - refill ratio 3
$32.26
528T "Will Fit" Replacement Fill Valve for original Ultramax ONLY $25.72 Enter a quantity and
2 THU013W Flush Valve - includes flapper assembly - Replaced by THU013P Discontinued Replaced by item #5
THU251W Flush Valve for Eco Ultramax Discontinued Replaced by item #5
3 THU331S Flapper with Chain - Replaces THU138S, THU175S & THU331S Discontinued Replaced by "will-fit" 2021
2021 "Will Fit" Replacement Flapper for original Ultramax THU331S $12.69 Enter a quantity and
4 THU253S Flapper with Chain for Eco Ultramax - Replaced by THU500S $17.21 Enter a quantity and
5 THU451.10A-A Drain Valve (flush valve) for 1.6 gpf - includes THU440-A flush tower assembly - Replaces discontinued THU013W and THU013P flush valves $31.97 Enter a quantity and
THU453.10C-A Drain Valve (flush valve) for Eco Ultramax - includes THU440-A flush tower assembly - Replaces discontinued THU251W, THU251P $31.81 Enter a quantity and
6 THU440-A Flush Tower Assembly - (includes THU407 flush tower seal gasket) $11.80 Enter a quantity and
7 THU407 Replacement Flush Tower Seal Gasket $8.81 Enter a quantity and
8 9BU002E Flush Valve Gasket $4.57 Enter a quantity and
9 THU004 Side Mount Trip Lever - Toto® OEM available finishes Select your finish and
"Will-Fit" THU004 Side Mount Trip Lever - special finishes - "Will Fit" trip lever Select your special finish and
10 THU044S Bolt Cap Covers (1 pair) Select your color and
Looking for a replacement toilet seat for your Toto Ultramax toilet? We've got them!

Replacement Parts for Toto Ultramax II Toilet
One Piece Models #MS604114CUFG or #MS604114CEF
Tank #CST604CEF(G) Tornado Flushing System 1.28 gpf
Tank #CST604CUFG Double Cyclone Flushing System 1.0 gpf
Current (2016) Tank #CST604CUFG Tornado Flushing System 1.0 gpf

The Ultramax II was previously known as the Gwyneth one-piece toilet
Parts diagram for Ultramax II toilets

Item # Part # Description Price & Quantity
1 TSU99A.X Fill Valve - Replaces TSU25A & TSU51A
- for 1.28 gpf set height of TSU99A.X to notch 9 - refill ratio 4
-  for 1.0 gpf set height of TSU99A.X to notch 12 - refill ratio 4
$32.26 Enter a quantity and
2 THU013W Flush Valve - includes flapper assembly Discontinued - use item # 4
3 THU500S Flapper with Chain - Use arrow #1, chain length #16, and lever hole #2
Replaces THU138S, THU175S & THU331S
$17.21 Enter a quantity and
4 THU453.10C-A Drain Valve (flush valve) - includes THU440-A flush tower assembly
Replaces discontinued THU251W, THU251P  and THU013W
$31.81 Enter a quantity and
5 THU440-A Flush Tower Assembly - (includes THU407 flush tower seal gasket) $11.80 Enter a quantity and
6 THU407 Replacement Flush Tower Seal Gasket $8.81 Enter a quantity and
7 9BU002E Flush Valve Gasket $4.57 Enter a quantity and
8 THU004 Side Mount Trip Lever - Toto® OEM available finishes Select your finish and
"Will-Fit" THU004 Side Mount Trip Lever - special finishes - "Will Fit" trip lever Select your special finish and
9 THU044S Bolt Cap Covers (1 pair) Select your color and
Looking for a replacement toilet seat for your Toto Ultramax II toilet? We've got them!

Toto Ultramax Toilet Parts Related Items



Frequently Asked Questions

Q. "How can I find the model number and color of my Toto toilet?"

A. Look inside your tank. Always exercise caution when removing the tank lid, as it is fragile and can be easily broken if stepped on or dropped. Inside your tank on the back wall of the tank or sometimes on the right hand wall (opposite the trip lever), you will see a model number stamped or engraved in the porcelain. Typically, for Toto toilets, you will see letters with a three-digit number. There may be more letters following, depending on additional features available on that model of the toilet. Elsewhere in your toilet tank, you will find a color code. Color codes start with a # followed by a two-digit number. The most common Toto colors are #01 - Cotton White, #03 - Bone, #04 - Gray, #11 - Colonial White, #12 - Sedona Beige, and #51 - Ebony.

How to find Toto toilet model number and color code

Q. "What's the difference between the original and 'Eco' versions of Toto toilets? Will the same parts work for both versions?"

A. "Eco" versions of Toto toilets have the same model number as the original version, but will have an "E" somewhere after the number. The only difference between the original and "Eco" versions is the amount of water they flush (1.6gpf vs 1.28gpf) - thus, they use a different flush valve and/or a different flapper that utilizes less water. The other internal components will typically be the same. Any internal differences will be noted on the product page.

Additionally, be aware that on occasion Toto has changed the NAME of certain lines, but the model number remains the same. For example, the Gwyneth one-piece is now the Ultramax II and the Gwyneth two-piece is now the Drake II. We have provided the most current names to better assist our customers, but please refer primarily to model NUMBER when selecting your toilet parts to ensure you're getting the right parts for your model.

Q. "How do the different Toto flushing systems work? Can I put parts from a different flushing system in my Toto toilet to change the gpf rate?"

A. Almost all of the Toto toilets (with the exception of a few older models that work like most other gravity-fed toilets), feature an extra wide 3" flush outlet and a larger trapway to deliver more water at a faster rate for a more powerful flush. We do NOT recommend attempting to put a different flushing system in your existing Toto toilet - toilets are designed holistically, meaning that the entire bowl, tank, internal parts, etc. are all designed to fit together in a very specific way. Even though some toilets might have similar parts and use similar technology, each toilet will perform differently based on additional factors like tank size, whether or not the porcelain has the Sanagloss finish, etc.

Learn more about the different flushing systems below:
  • Power Gravity: One of Toto's older flushing systems, this system was designed to provide maximum flush efficiency in low-profile toilets. Because of the smaller tank size, there is less water in the tank to "push" waste out of the toilet when flushing, but this is still one of the most powerful and efficient flushing systems for low-profile toilets.
  • G-Max & E-Max: As mentioned above, the big difference between the G-Max and E-Max flushing systems is the amount of water used per flush. As the industry moves toward all toilets being 1.28gpf, the E-Max is essentially a "retro-fit" of the G-Max design. Like most standard toilet bowls, the water rinses straight down when you flush - so you still get a powerful flush and rinse.
  • Cyclone: A Cyclone flushing system uses a single nozzle located at the tank end of the bowl just under the lip of the bowl which has no rim holes. When the toilet is flushed, water streams out of the nozzle towards the front of the bowl causing the water to swirl around the complete inside of the bowl. This Cyclone rinsing action not only completely cleans the bowl but effectively helps flush the bowl. The Cyclone efficiently out-performs other gravity flushing toilets.
  • Double Cyclone: The Double Cyclone is considered by many as the "best" Toto flushing system. It provides the same powerful flush as the Power Gravity, the G-Max/E-Max and the Cyclone systems, only better! Instead of one bowl entry nozzle the Double Cyclone has two opposite side rinse inlets flowing the same direction creating more swirling force than a single rinse inlet. Basically, the water quickly swirls around the bowl when you flush, causing a wash down effect that leaves the bowl cleaner - while still using only 1.28gpf.
  • Dual Max: This is Toto's first dual flush system - delivering only 0.9 gallons per half-flush and 1.6 gallons per full flush, without sacrificing the performance you expect from Toto toilets.
  • Tornado: The Tornado flush uses gravity and two powerful nozzles to create a centrifugal, cyclonic action reducing waste build-up. Water is forced to spin around the rim and bowl creating a more powerful flush. The two nozzles replace rim holes to maximize the bowl and rim cleaning action with less trapped dirt. This high efficiency dual nozzle water propulsion system is used for 1 gallon or 1.28 gallon per flush toilets. The Tornado flushing system is considered to be more effective in one flush than most toilets are with multiple flushes.

Q. "Toto uses many different letters before and after their numbers stamped on the inside back of the toilet tank. Are these letters just part of the number or do they have some significance?"

A. The letters shown with the part numbers are part of the Toto number and they are very significant. Each letter or combination of letters are different codes used by Toto to completely and accurately designate what the toilet or tank consisted of when it was sold. The letters MS listed before model numbers means the toilet includes a seat. The following is a list of letters Toto uses and what they mean: B=Bolt down tank lid; C=Cyclone or Tornado flush; CST=Gravity type toilet; CT=Bowl; D=Insulated tank; E=E-max 1.28 gpf; F=Universal bowl height 16.125"; G= Sanigloss or CeFiONtect (ceramic glaze); L=ADA height 16.5" high bowl; M=Dual-Max; R=Right hand tank lever; S=G-Max; ST=Tank; T=Drain valve tower type; U=Ultra low volume (1.0 gallon).

Example: CST604CUFG: CST=Gravity type toilet; 604=Ultramax II tank model number; C=Tornado flush; U=Ultra low volume (1.0 gallon); F=Universal height; G=CeFiONtect (ceramic glaze);

Have questions about toilet parts or toilet repair?

Toilet Repair Information & FAQs


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