Nexus Toilet Repair Parts

by Toto

The sleek, ultra-modern look of Toto's Nexus toilet are the perfect complement to its water-saving efficiency and top-notch performance. Whether you're looking for repair parts to keep this stylish hunk of porcelain running like new or you've just lost your bolt cap covers and need replacements, PlumbingSupply.com® is your source for quality Toto toilet parts.


Please note: The Waza® Miyabi series of toilets is based upon the Eco Nexus toilet and uses the same parts.
Specialty painted toiletBamboo & Plum
Specialty painted toiletMaple Leaf
Specialty painted toiletPlum Tree
Specialty painted toiletPine Tree

Replacement Parts for Toto Nexus & Eco Nexus Toilets
Two Piece Model #CST794SF or  Eco Nexus #CST794EF
Tank #ST794S G-Max Flushing System
1.6 gpf
Tank #ST794E E-Max Flushing System
1.28 gpf

Parts diagram for Nexus toilets
Item # Image Part # Description Price & Quantity
1 toto fill valve tsu99a-x TSU99A.XR Fill Valve - Replaces TSU08A.6, TSU16A, TSU28A, & TSU36A.6
- (set height of TSU99A.XR to notch 5 - refill ratio 3 for both 1.6 gpf and 1.28 gpf)
$37.31 Enter a quantity and
toto will fit high output fill valve 528t 528T "Will Fit" High Output Fill Valve for original Nexus ONLY $26.99 Enter a quantity and
2 toto flush valev thu129p-a THU129P-A Flush Valve - includes flapper & locknut Discontinued use item 4 THU441.10J-A
toto flush valve thu252p-a THU252P-A Flush Valve for Eco Nexus - includes flapper & locknut - Replaces THU252W-2A Discontinued use item 4 THU441.10D-A
3 toto universal flapper thu500s THU500S Universal Flapper with Chain - Use arrow #7, chain length #16, and lever hole #1
Replaces THU138S, THU175S, THU331S, & THU369S
$14.99 Enter a quantity and
toto will-fit flapper 2021 2021 "Will Fit" Replacement Flapper for original Nexus ONLY $13.32 Enter a quantity and
toto universal flapper thu500s THU500S Flapper with Chain for Eco Nexus - Replaces THU253S
Use arrow #1, chain length #16, and lever hole #1
$14.99 Enter a quantity and
Item # Image Part # Description Price & Quantity
4 toto drain valve with flush tower thu44110j-a THU441.10J-A Drain Valve with Flush Tower - replaces flush valve THU129P-A $20.78 Enter a quantity and
toto drain valve with flush tower thu444-10d-a THU444.10D-A Drain Valve with Flush Tower for Eco Nexus - replaces flush valve THU252P-A $20.84 Enter a quantity and
5 toto flush tower top half assembly thu440-a THU440-A Flush Tower Assembly - (includes THU407 flush tower seal gasket) Discontinued
order complete drain valve
6 toto flush tower seal gasket thu407 THU407 Flush Tower Seal Gasket $12.35 Enter a quantity and
7 toto flush valve gasket 9bu002e 9BU002E Drain Valve (flush valve) Gasket - fits THU252P-A, THU441.10D-A, and THU441.10J-A Discontinued
8 toto tank to bowl gasket 9bu024e 9BU024E 3" Tank to Bowl Gasket - Toto® OEM -
View Dimensions
$7.14 Enter a quantity and
9 toto tank to bowl mounting hardare tsu01d THU833-A (old TSU01D) Tank to Bowl Mounting Kit $11.59 Enter a quantity and
Item # Image Part # Description Price & Quantity
10 toto side mount trip lever chrome for nexus thu164-cp THU164 #CP Toto® OEM Side Mount Trip Lever - Chrome Discontinued
image unavailable THU164 #BN Toto® OEM Side Mount Trip Lever - Brushed Nickel Discontinued
image unavailable THU164 #PB Toto® OEM Side Mount Trip Lever - Polished Brass Discontinued
image unavailable THU164 #PN Toto® OEM Side Mount Trip Lever - Polished Nickel Discontinued Enter a quantity and
11 toto bolt caps thu044s cotton white THU044S#01 Bolt Cap Covers (1 pair) - Cotton White $10.83 Enter a quantity and
toto bolt caps thu044s bone THU044S#03 Bolt Cap Covers (1 pair) - Bone $13.50 Enter a quantity and
toto bolt caps thu044s colonial white THU044S#11 Bolt Cap Covers (1 pair) - Colonial White $13.26 Enter a quantity and
toto bolt caps thu044s sedona beige THU044S#12 Bolt Cap Covers (1 pair) - Sedona Beige $13.57 Enter a quantity and
toto bolt caps thu044s ebony THU044S#51 Bolt Cap Covers (1 pair) - Ebony $13.67 Enter a quantity and
Item # Image Part # Description Price & Quantity
12 toto top mounting seat hardware thu651n THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
Not Shown toto toilet seat ss114-03 bone SS114
Elongated Seat
view dimensions
Toto® OEM Slow Closing Toilet Seat - Bone $98.65 Enter a quantity and
toto toilet seat ss114-11 colonial white Toto® OEM Slow Closing Toilet Seat - Colonial White $81.22 Enter a quantity and
toto toilet seat ss114-01 cotton white Toto® OEM Slow Closing Toilet Seat - Cotton White $82.81 Enter a quantity and
toto genuine toilet seat colonial sedona beige elongated Toto® OEM Slow Closing Toilet Seat - Sedona Beige $96.51 Enter a quantity and
toto genuine toilet seat ebony elongated Toto® OEM Slow Closing Toilet Seat - Ebony $114.72 Enter a quantity and
Not Shown image unavailable "Will-Fit"
Elongated Seat
Premium Quality Replacement Toilet Seat by Bemis - Cotton White - Slow closing with easy-clean & change hinge $77.03 Enter a quantity and
image unavailable Premium Quality Replacement Toilet Seat by Bemis - Sedona Beige (Biscuit/Linen) - Slow closing with easy-clean & change hinge $77.03 Enter a quantity and
image unavailable Premium Quality Replacement Toilet Seat by Bemis - Ebony (Black/Onyx) - Slow closing with easy-clean & change hinge $152.68 Enter a quantity and
The toilet seats featured here are the manufacturer's closest color match available & are non-returnable. View more Wiil-Fit Premium Quality colored toilet seats.

Replacement Parts for Toto Nexus
1-Piece Toilets
#MS642124CEFG / #CST642CEFGAT40 Tornado Flushing System 1.28 gpf

Parts diagram for Nexus 1-Piece toilets
Item # Image Part # Description Price & Quantity
1 toto fill valve tsu99a-x TSU99A.XR Fill Valve - Replaces TSU82.35A
- (set height of TSU99A.XR to notch 5 - refill ratio 3 for 1.28 gpf)
$37.31 Enter a quantity and
2 toto flush valve tower thu747-a THU747-A Complete Flush Valve - includes flush tower and seal gasket
- (Note: flush tower not sold separately)
$35.16 Enter a quantity and
3 toto flush tower seal gasket thu407 THU407 Flush Tower Seal Gasket $12.35 Enter a quantity and
4 toto flush valve gasket 9bu002e 9BU002E Drain Valve (flush valve) Gasket Discontinued
5 toto trip lever chrome thu750-cp THU750-#CP Toto® OEM Side Mount Trip Lever - Chrome $38.75 Enter a quantity and
image unavailable THU750-#01 Toto® OEM Side Mount Trip Lever - Cotton White $38.85 Enter a quantity and
image unavailable THU750-#BN Toto® OEM Side Mount Trip Lever - Brushed Nickel $53.97 Enter a quantity and
image unavailable THU750-#PN Toto® OEM Side Mount Trip Lever - Polished Nickel $48.60 Enter a quantity and
6 toto top mounting seat hardware thu651n THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
Item # Image Part # Description Price & Quantity
Not Shown toto elongated softclose toilet seat ss124-03 bone SS124
Elongated Seat
view dimensions
Toto® OEM Slow Closing Toilet Seat - Bone $95.19 Enter a quantity and
toto elongated softclose toilet seat ss124-11 colonial white Toto® OEM Slow Closing Toilet Seat - Colonial White $82.83 Enter a quantity and
toto elongated softclose toilet seat ss124-01 cotton white Toto® OEM Slow Closing Toilet Seat - Cotton White $82.79 Enter a quantity and
toto elongated softclose toilet seat ss124-51 ebony Toto® OEM Slow Closing Toilet Seat - Ebony $122.93 Enter a quantity and
toto elongated softclose toilet seat ss124-12 sedona beige Toto® OEM Slow Closing Toilet Seat - Sedona Beige $95.25 Enter a quantity and

Replacement Parts for Toto Nexus
1-Piece Toilets
#MS642124CUFG, MS642234CUFG, CST642CUFGAT40
MW6423046CUFGA & MW6423056CUFGA
Tornado Flushing System 1.0 gpf

Parts diagram for Nexus 1-Piece toilet model 642
Item # Part # Description Price & Quantity
1 TCU642CRU #01 Toilet Tank Lid - Cotton White $101.95 Enter a quantity and
TCU642CRU #03 Toilet Tank Lid - Bone $102.76 Enter a quantity and
TCU642CRU #11 Toilet Tank Lid - Colonial White $101.98 Enter a quantity and
TCU642CRU #12 Toilet Tank Lid - Sedona White $102.35 Enter a quantity and
TCU642CRU #51 Toilet Tank Lid - Ebony $118.95 Enter a quantity and
2 TSU82.35-A Fill Valve $34.95 Enter a quantity and
3 THU771-A Flush Valve $43.35 Enter a quantity and
4 THU474 Seal Gasket (1pc) $5.95 Enter a quantity and
5 THU475 Seal Gasket (10pcs) $39.83 Enter a quantity and
6 THU485 #CP Trip Lever Handle Assembly - Chrome $39.98 Enter a quantity and
THU485 #01 Trip Lever Handle Assembly - Cotton White $39.96 Enter a quantity and
THU485 #BN Trip Lever Handle Assembly - Brushed Nickel $54.95 Enter a quantity and
THU485 #PN Trip Lever Handle Assembly - Polished Nickel $49.76 Enter a quantity and
7 THU764 #01-A Toilet Mounting Hardware - Cotton White & Cokonial White $35.80 Enter a quantity and
THU764 #03-A Toilet Mounting Hardware - Bone $35.88 Enter a quantity and
THU764 #12-A Toilet Mounting Hardware - Sedona Beige $35.90 Enter a quantity and
THU764 #51-A Toilet Mounting Hardware - Ebony $35.95 Enter a quantity and
8 THU651N Top Mounting Hardware for Seat $11.92 Enter a quantity and
9 TSU10W.12 Unifit Rough-in 12" $97.65 Enter a quantity and
10 TSU10W.14 Unifit Rough-in 14" $97.70 Enter a quantity and
11 0GU186-A Template $6.96 Enter a quantity and
12 THU766 Auto Flush unit for single flush 1G $136.49 Enter a quantity and
Not Shown SS124
Elongated Seat
view dimensions
Toto® OEM Slow Closing Toilet Seat - Bone $95.19 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Colonial White $82.83 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Cotton White $82.79 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Ebony $122.93 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Sedona Beige $95.25 Enter a quantity and

Replacement Parts for Toto Nexus
2-Piece Toilets
#MS442124CUFG, MS442234CUFG, MW4423046CUFGA & MW4423056CUFGA
Tornado Flushing System 1.0 gpf

Parts diagram for Nexus 1-Piece toilet model 442
Item # Part # Description Price & Quantity
1 TCU442CRU Toilet Tank Lid Discontinued
(All Colors)
2 THU485 #CP Trip Lever Handle Assembly - Chrome $39.98 Enter a quantity and
THU485 #01 Trip Lever Handle Assembly - Cotton White $39.96 Enter a quantity and
THU485 #BN Trip Lever Handle Assembly - Brushed Nickel $54.95 Enter a quantity and
THU485 #PN Trip Lever Handle Assembly - Polished Nickel $49.76 Enter a quantity and
3 TSU83.35-A Fill Valve $35.65 Enter a quantity and
4 THU759-A Flush Valve $40.83 Enter a quantity and
5 THU407 Seal Gasket (1 piece) $12.35 Enter a quantity and
6 THU370 Seal Gasket (10 pieces) $59.95 Enter a quantity and
7 9BU024E Tank to Bowl Gasket - Toto® OEM -
View Dimensions
$7.14 Enter a quantity and
8 THU131 Tank to Bowl Gaskets (10 pieces) Not Available - Use #7 Enter a quantity and
9 THU833-A (old #TSU01D) Tank to Bowl Mounting Kit $11.59 Enter a quantity and
10 THU764 #01-A Toilet Mounting Hardware - Cotton White & Cokonial White $35.80 Enter a quantity and
THU764 #03-A Toilet Mounting Hardware - Bone $35.88 Enter a quantity and
THU764 #12-A Toilet Mounting Hardware - Sedona Beige $35.90 Enter a quantity and
THU764 #51-A Toilet Mounting Hardware - Ebony $35.95 Enter a quantity and
11 THU651N Top Mounting Hardware for Seat $11.92 Enter a quantity and
12 9AU321-A Fill Valve Extension Adapter $10.99 Enter a quantity and
13 TSU10W.12 Unifit Rough-in 12" $97.65 Enter a quantity and
14 TSU10W.14 Unifit Rough-in 14" $97.70 Enter a quantity and
15 0GU186-A Template $6.96 Enter a quantity and
16 THU766 Auto Flush unit for single flush 1G $136.49 Enter a quantity and
Not Shown SS124
Elongated Seat
view dimensions
Toto® OEM Slow Closing Toilet Seat - Bone $95.19 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Colonial White $82.83 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Cotton White $82.79 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Ebony $122.93 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Sedona Beige $95.25 Enter a quantity and

Replacement Parts for Toto Nexus
2-Piece Toilets
#MS442124CEFG, MS442234CEFG, MW4423046CEFGA & MW4423056CEFGA
Tornado Flushing System 1.28 gpf

Parts diagram for Nexus 1-Piece toilet model 442ea
Item # Part # Description Price & Quantity
1 TCU442CRE #01 Toilet Tank Lid - Cotton White - (No other colors avaiilable) $89.88 Enter a quantity and
2 TSU83.35-A Fill Valve - RR35 - (remote refill 35%) $35.65 Enter a quantity and
3 THU652-A Flush Valve $37.40 Enter a quantity and
4 THU750#CP Trip Lever $38.75 Enter a quantity and
5 THU407 Seal Gasket (1 piece) $12.35 Enter a quantity and
6 THU370 Seal Gasket (10 pieces) $59.95 Enter a quantity and
7 9BU024E Tank to Bowl Gasket - Toto® OEM -
View Dimensions
$7.14 Enter a quantity and
8 THU131 Tank to Bowl Gaskets (10 pieces) Not Available - Use #7
9 TSU01D Tank Mounting Hardware $11.59 Enter a quantity and
10 THU764 #01-A Toilet Mounting Hardware - Cotton White & Cokonial White $35.80 Enter a quantity and
THU764 #03-A Toilet Mounting Hardware - Bone $35.88 Enter a quantity and
THU764 #12-A Toilet Mounting Hardware - Sedona Beige $35.90 Enter a quantity and
THU764 #51-A Toilet Mounting Hardware - Ebony $35.95 Enter a quantity and
11 THU651N Top Mounting Hardware for Seat $11.92 Enter a quantity and
12 9AU321-A Fill Valve Extension Adapter $10.99 Enter a quantity and
13 TSU10W.12 Unifit Rough-in 12" $97.65 Enter a quantity and
14 TSU10W.14 Unifit Rough-in 14" $97.70 Enter a quantity and
15 0GU186-A Template $6.96 Enter a quantity and
16 THU767 Auto Flush unit for single flush $136.51 Enter a quantity and
Not Shown SS124
Elongated Seat
view dimensions
Toto® OEM Slow Closing Toilet Seat - Bone $95.19 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Colonial White $82.83 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Cotton White $82.79 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Ebony $122.93 Enter a quantity and
Toto® OEM Slow Closing Toilet Seat - Sedona Beige $95.25 Enter a quantity and

Toto Nexus 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.
  • Dynamax Tornado: The Dynamax Tornado flush sends 100% of the water through the rim of the bowl so all of the water gets used to clean the bowl and remove the waste using less water more efficiently. When the toilet is flushed the Dynamax system creates a vortex using a pushing force to discharge the waste first. The powerful bowl wash combined with the waste discharge dramitically improves the amount flushed out and away. This new discharge design make for a quieter and more powerful bowl evacuation.

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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