Aquia IV Toilet Repair Parts

by Toto

The Aquia series of toilets by Toto offers you a contemporary look with innovative flushing technology. However, as with anything else that has moving parts, sometimes that flushing mechanism can break. Fix it up and get it running like new again with parts designed specifically for your Aquia toilet right here at PlumbingSupply.com® - your source for quality Toto toilet parts.
Order replacement parts for your Aquia toilet below

Replacement Parts
for Toto Aquia IV Toilet
Two Piece Model #CST446CUMG Tank #ST446UM - Dynamax Tornado Flushing System 1.0 gpf & 0.8 gpf
Two Piece Models #CST446CEMG, #CST446CEMFG, #CST446CEMFGN - Tank #ST446EM
Dynamax Tornado Flushing System 1.28 gpf & 0.8 gpf

Parts diagram for Aquia IV toilets
Item # Part # Description Price & Quantity
1 TSU83.07-A Fill Valve Assembly $37.31 Enter a quantity and
2 THU737N-A Flush Valve - 1 gpm (for tank ST446UM) - (includes item #3 seal gasket) $42.77
THU738N-A Flush Valve - 1.28 gpm (for tank ST446EM) Discontinued
Replaced by THU738R-A
THU738R-A Dual Flush Valve - 1.28/0.8 gpm - Auto Flush Compatible (for tank ST446EM) $39.57 Enter a quantity and
3 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
4 THU735#01-A Push Button Assembly - Cotton White $31.85
THU735#BN-A Push Button Assembly - Brushed Nickel $65.52
THU735#CP-A Push Button Assembly - Chrome Plated $31.85
THU735#PN-A Push Button Assembly - Polished Nickel $65.54 Enter a quantity and
5 TCU446CRU#01 Tank Lid - Cotton White - (for tank ST446UM only) $93.73
TCU446CRU#03 Tank Lid - Bone - (for tank ST446UM only) $108.29
TCU446CRU#11 Tank Lid - Colonial White - (for tank ST446UM only) $103.77
TCU446CRU#12 Tank Lid - Sedona Beige - (for tank ST446UM only) $108.33
TCU446CRU#51 Tank Lid - Ebony - (for tank ST446UM only) $139.25 Enter a quantity and
#TCU446CRE#01 Tank Lid - Cotton White - (for tank ST446EM only) $93.75
#TCU446CRE#03 Tank Lid - Bone - (for tank ST446EM only) $108.31
#TCU446CRE#11 Tank Lid - Colonial White - (for tank ST446EM only) $103.79
#TCU446CRE#12 Tank Lid - Sedona Beige - (for tank ST446EM only) $108.35
#TCU446CRE#51 Tank Lid - Ebony - (for tank ST446EM only) $139.29 Enter a quantity and
6 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
7 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
8 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
9 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
THU742#03-A Toilet Mounting Hardware - (for #03 Bone) $23.66
THU742#12-A Toilet Mounting Hardware - (for #12 Sedona Beige) Not Available
THU742#51-A Toilet Mounting Hardware - (for #51 Ebony) $19.15 Enter a quantity and
10 THU107 Velcro Tape $10.92 Enter a quantity and
11 0GU181-A Unifit Rough-in Template - 12" $5.76
0GU182-A Unifit Rough-in Template - 10" & 14" $6.39 Enter a quantity and
12 TSU08W.10 Unifit 10" Rough-In $110.95
TSU08W.12 Unifit 12" Rough-In $110.97
TSU08W.14 Unifit 14" Rough-In $110.99 Enter a quantity and

Replacement Parts
for Toto Aquia IV Toilet
Two-Piece Models: #MS436124CEMFGN - Tank #ST436EMNA -
Dynamax Tornado Flushing System 1.28 gpf & 0.9 gpf

Parts diagram for Aquia IV toilet MS436124CEMFGN
Item # Part # Description Price & Quantity
1 TCU436CRE#01 Tank Lid - Cotton Discontinued
2 THU806#CP-A Left Hand Trip Lever - Chrome $39.29 Enter a quantity and
THU816#CP-A Right Hand Trip Lever - Chrome $39.27 Enter a quantity and
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU803.13-A Fill Valve Discontinued
5 THU837-A Flush Valve Assembly, 1.28 / 0.9 GPF Discontinued
THU838-A Flush Valve Assembly, 1.28 / 0.9 GPF - Right Hand Trip Lever Discontinued
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 0GU181-1-A 12" Unifit Rough-in Template Discontinued
0GU182-1-A 10" & 14" Unifit Rough-in Template Discontinued
10 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
11 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
12 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11 Enter a quantity and
13 TSU48.10 Unifit Rough-in 10" Discontinued
TSU48.12 Unifit Rough-in 12" Discontinued
TSU48.14 Unifit Rough-in 14" Discontinued
14 0EU148-A Dual Flush Sticker (Top of Lid) $2.95 Enter a quantity and
15 THU765 Autoflush Unit for Dual Flush $119.79 Enter a quantity and
16 9AU321-A Fill Valve extension adapter $10.99 Enter a quantity and

Replacement Parts
for Toto Aquia IV Toilet
Two-Piece Models: #MS446234CEMG, MW4463056CEMFGNA, MW4483074CEMFGN, MW4463074CEMFGN, MW4463074CEMGN, MW4463084CEMGN, MW4483056CEMFGNA, MW4483084CEMFGN - Tank #ST446EMAN -
Dynamax Tornado Flushing System 1.28 gpf & 0.9 gpf

Parts diagram for Aquia IV toilet MS446234
Item # Part # Description Price & Quantity
1 TCU446CRE#01 Tank Lid - Cotton White - (for tank ST446EM only) $93.75
TCU446CRE#03 Tank Lid - Bone - (for tank ST446EM only) $108.31
TCU446CRE#11 Tank Lid - Colonial White - (for tank ST446EM only) $103.79
TCU446CRE#12 Tank Lid - Sedona Beige - (for tank ST446EM only) $108.35
TCU446CRE#51 Tank Lid - Ebony - (for tank ST446EM only) $139.29 Enter a quantity and
2 THU842#01-A Push Button Assembly - Cotton Discontinued
THU842#BN-A Push Button Assembly - Brushed Nickel Discontinued
THU842#CP-A Push Button Assembly - Chrome Plated Discontinued
THU842#PN-A Push Button Assembly - Polished Nickel Discontinued
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU803.13-A Fill Valve Discontinued
5 THU847-A Flush Valve Assembly, 1.28gpf Discontinued
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 THU765 Auto Flush unit for Dual Flush $119.79 Enter a quantity and
10 0GU181-1-A 12" Unifit Rough-in Template Discontinued
0GU182-1-A 10" & 14" Unifit Rough-in Template Discontinued
11 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
12 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
13 9AU321-A Fill Valve extension adapter $10.99
14 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
THU742#03-A Toilet Mounting Hardware - (for #03 Bone) $23.66
THU742#12-A Toilet Mounting Hardware - (for #12 Sedona Beige) Discontinued
THU742#51-A Toilet Mounting Hardware - (for #51 Ebony) $19.15 Enter a quantity and
15 TSU48.10 Unifit Rough-in 10" Discontinued
TSU48.12 Unifit Rough-in 12" Discontinued
TSU48.14 Unifit Rough-in 14" Discontinued

Replacement Parts
for Toto Aquia IV Toilet
Two-Piece Model: #MS446234CUMG, MW4463046CUMGA - Tank #ST446UMA -
Dynamax Tornado Flushing System 1.0 gpf & 0.8 gpf

Parts diagram for Aquia IV toilet MS446234CUMG
Item # Part # Description Price & Quantity
1 TCU446CRU#01 Tank Lid - Cotton White - (for tank ST446UM only) $93.73
TCU446CRU#03 Tank Lid - Bone - (for tank ST446UM only) $108.29
TCU446CRU#11 Tank Lid - Colonial White - (for tank ST446UM only) $103.77
TCU446CRU#12 Tank Lid - Sedona Beige - (for tank ST446UM only) $108.33
TCU446CRU#51 Tank Lid - Ebony - (for tank ST446UM only) $139.25 Enter a quantity and
2 THU735#01-A Push Button Assembly - Cotton White $31.85
THU735#BN-A Push Button Assembly - Brushed Nickel $65.52
THU735#CP-A Push Button Assembly - Chrome Plated $31.85
THU735#PN-A Push Button Assembly - Polished Nickel $65.54 Enter a quantity and
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU83.07-A Fill Valve Assembly $37.31 Enter a quantity and
5 THU737N-A Flush Valve - 1 gpm (for tank ST446UM) - (includes item #3 seal gasket) $42.77
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 THU765 Auto Flush unit for Dual Flush $119.79 Enter a quantity and
10 0GU181-A Unifit Rough-in Template - 12" $5.76
0GU182-A Unifit Rough-in Template - 10" & 14" $6.39 Enter a quantity and
11 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
12 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
13 9AU321-A Fill Valve extension adapter $10.99
14 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
THU742#03-A Toilet Mounting Hardware - (for #03 Bone) $23.66
THU742#12-A Toilet Mounting Hardware - (for #12 Sedona Beige) Discontinued
THU742#51-A Toilet Mounting Hardware - (for #51 Ebony) $19.15 Enter a quantity and
15 TSU08.10 Unifit Rough-in 10" Discontinued
TSU08.12 Unifit Rough-in 12" Discontinued
TSU08.14 Unifit Rough-in 14" Discontinued

Replacement Parts
for Toto Aquia IV Toilet
Two-Piece Model: #MS448124CEMFGN, MW4484726CEMFGNA - Tank #ST448EMAN
Dynamax Tornado Flushing System 1.28 gpf & 0.9 gpf

Parts diagram for Aquia IV toilet MS448124CEMFGN
Item # Part # Description Price & Quantity
1 TCU448CR#01 Tank Lid - Cotton $99.98 Enter a quantity and
2 THU806#CP-A Left Hand Trip Lever - Chrome $39.29 Enter a quantity and
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU803.13-A Fill Valve Discontinued
5 THU837-A Flush Valve Assembly, 1.28 / 0.9 GPF Discontinued
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 THU765 Autoflush Unit for Dual Flush $119.79 Enter a quantity and
10 0GU181-1-A 12" Unifit Rough-in Template Discontinued
0GU182-1-A 10" & 14" Unifit Rough-in Template Discontinued
11 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
12 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
13 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
14 TSU48.10 Unifit Rough-in 10" Discontinued
TSU48.12 Unifit Rough-in 12" Discontinued
TSU48.14 Unifit Rough-in 14" Discontinued
15 0EU148-A Dual Flush Sticker (Top of Lid) $2.95
16 9AU321-A Fill Valve extension adapter $10.99

Replacement Parts
for Toto Aquia IV Toilet
One-Piece Model: #MS646234CUMFG - Dynamax Tornado Flushing System 1.0 gpf & 0.8 gpf

Parts diagram for Aquia IV toilet model MS646234CUMFG
Item # Part # Description Price & Quantity
1 TCU646CRU#01 Tank Lid w/ velcro tape - Cotton $94.98 Enter a quantity and
TCU642CRU#03 Tank Lid w/ velcro tape - Bone $108.75 Enter a quantity and
TCU646CRU#11 Tank Lid w/ velcro tape - Colonial White $95.39 Enter a quantity and
TCU646CRU#12 Tank Lid w/ velcro tape - Sedona Beige $108.77 Enter a quantity and
TCU646CRU#51 Tank Lid w/ velcro tape - Ebony $119.83 Enter a quantity and
2 THU736#01-A Push Button Assembly - Cotton $31.85 Enter a quantity and
THU736#BN-A Push Button Assembly - Brushed Nickel $65.57 Enter a quantity and
THU736#CP-A Push Button Assembly - Chrome Plated $31.83 Enter a quantity and
THU736#PN-A Push Button Assembly - Polished Nickel $65.55 Enter a quantity and
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU821.07-A Fill Valve Discontinued
5 THU739S-A Flush Valve Assembly, 1.0gpf $45.49 Enter a quantity and
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
THU742#03-A Toilet Mounting Hardware - (for #03 Bone) $23.66
THU742#12-A Toilet Mounting Hardware - (for #12 Sedona Beige) Discontinued
THU742#51-A Toilet Mounting Hardware - (for #51 Ebony) $19.15 Enter a quantity and
10 TSU08W.10 Unifit 10" Rough-In $110.95
TSU08W.12 Unifit 12" Rough-In $110.97
TSU08W.14 Unifit 14" Rough-In $110.99 Enter a quantity and
11 0GU181-A Unifit Rough-in Template - 12" $5.76
0GU182-A Unifit Rough-in Template - 10" & 14" $6.39 Enter a quantity and
12 THU765 Autoflush Unit for Dual Flush $119.79 Enter a quantity and

Replacement Parts
for Toto Aquia IV Toilet
Two-Piece Models: #MW4363046CEMFGNA, MW4363056CEMFGNA, MW4363074CEMFGN, MW4363084CEMFGN
Tank: #ST436EMRAN - Dynamax Tornado Flushing System 1.28 gpf & 0.9 gpf

Parts diagram for Aquia IV toilet model MS646234CUMFG
Item # Part # Description Price & Quantity
1 TCU436CRE#01 Tank Lid - Cotton Discontinued
2 THU806#CP-A Left Hand Trip Lever - Chrome $39.29 Enter a quantity and
THU816#CP-A Right Hand Trip Lever - Chrome $39.27 Enter a quantity and
3 THU107 Velcro Tape $10.92 Enter a quantity and
4 TSU803.13-A Fill Valve Discontinued
5 THU837-A Flush Valve Assembly, 1.28 / 0.9 GPF Discontinued
THU838-A Flush Valve Assembly, 1.28 / 0.9 GPF - Right Hand Trip Lever Discontinued
6 THU651N Top Mounting Seat Hardware $11.92 Enter a quantity and
7 9BU112E-A Replacement Seal Gasket for flush valve - (fits both THU737N-A and THU738N-A) $5.75 Enter a quantity and
8 THU744 Seal Gasket for Flush Valve (10 pieces) $59.15 Enter a quantity and
9 0GU181-1-A 12" Unifit Rough-in Template Discontinued
0GU182-1-A 10" & 14" Unifit Rough-in Template Discontinued
10 THU741-A Tank To Bowl Mounting Hardware $32.76 Enter a quantity and
11 9BU109E-A Tank To Bowl Gasket - (included with THU741-A above) $10.95 Enter a quantity and
12 THU742#01-A Toilet Mounting Hardware - (for #01 Cotton & #11 Colonial White) $19.11
13 TSU48.10 Unifit Rough-in 10" Discontinued
TSU48.12 Unifit Rough-in 12" Discontinued
TSU48.14 Unifit Rough-in 14" Discontinued
14 0EU148-A Dual Flush Sticker (Top of Lid) $2.95
15 THU765 Autoflush Unit for Dual Flush $119.79 Enter a quantity and
16 9AU321-A Fill Valve extension adapter $10.99

Toto Aquia 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);

Q. "How do you install the THU435 Flush Valve?"
A. In order to install the THU435 Flush Valve you will need to take the toilet tank off of the toilet bowl.
Step 1)  You will first need to turn off your water supply to the tank and unscrew the supply line from the fill valve connection at the bottom of the tank. Since there will be water left in the supply line you may want to dump the water into a bowl of some kind. A bucket may be too tall.
Step 2)  Drain all the water from the tank, use a sponge or absorbent rag to soak up any remaining water and squeeze it into the toilet bowl or sink. If you have a portable shop vacuum it will really come in handy for removing the remaining water in the tank.
Step 3)  Unscrew the tank-to-bowl bolts and remove them.
Step 4)  Remove the tank from off the bowl and place the tank in an area where you will have space to work on removing the flush valve from the tank.
Step 5)  Take the rubber tank-to-bowl gasket off of the flush valve nut on the bottom of the tank to expose the nut.
Step 6)  Using a large pair of pump pliers, channel locks, or monkey wrench, unscrew the flush valve nut counter-clockwise. You may need to hold the flush valve on the inside of the tank with your other hand. Once the nut is loosened remove it from off the flush valve.
Step 7)  From the inside of the tank remove the flush valve by pulling it out making sure the gasket attached to the flush valve against the inside of the tank is removed also.
Step 8)  Make sure the new flush valve has the flush valve seal attached onto the threads with the ribbed side of the gasket facing down towards the threaded portion of the flush valve. Slide the flush valve inside the tank into the hole in the bottom of the tank so that the gasket ribs push down against the inside bottom of the tank. The overflow tube should be faced toward the fill valve. From the outside of the tank screw the nut onto the threads clockwise and tighten snugly with a wrench.
Step 9)  Attach the tank-to-bowl gasket onto the bottom of the flush valve threads and push it firmly against the bottom of the tank.
Step 10)  Put the tank back onto the bowl and attach the tank-to-bowl bolts. Tighten the tank-to-bowl bolts evenly. One or two turns on one of them and then one or two turns on the opposite one so as not to tighten one side more than the other to prevent breaking the tank.
Step 11)  Reattach the water supply line and turn the water on.
Step 12)  Check for leaks using a dry paper towel at all connections.

Q. "How do you install the THU338 Dual Flush Valve?"
A. Step 1)  You must first remove the top float section of the flush valve assembly from the base of the flush valve assembly. If the tab in the base slot is on the right side of the center release channel, then move the top portion of the flush valve assembly clockwise until the tab lines up in the center of the center release channel. (see Figure 1) If the tab in the base slot is on the left side of the center release channel, then move the top portion of the flush valve assembly counter-clockwise until the tab lines up in the center of the center release channel. (see Figure 2) There are two center release channels, located directly across from each other. When both are aligned, then the top float section can be pulled straight up away from the base section. (see Figure 3)
Step 2)  Now that the base section is fully exposed, (see Figure 4), the mounting screw can be loosened in the half moon clevis to let the half moon section drop down 1/2" to 5/8" below the base section. Do not remove the half moon part of the clevis from the mounting screw. The half moon configuration allows the clevis to be inserted into the opening in the tank by tipping the top of the base section enough to allow one side of the half moon to be inserted in to the tank opening. Now tip the top of the base section the opposite way to allow the other half of the half moon to be inserted inside the tank hole.
Step 3)  Once the half moon is fully inserted on both sides of the hole, begin to tighten the mounting screw while keeping tension on the base section by pulling the base section upwards with one hand until the base section washer is tightened snuggly against the perimeter of the flush valve tank opening. You will want to position the overflow tube of the base section on the side closest to the fill valve.
Step 4)  After the base section is tightened correctly, the top float section can be put back on to the base. Align the locking tabs with the center release channels and turn the top float section so the locking tabs will lock into the base slots.

Have questions about toilet parts or toilet repair?

Toilet Repair Information & FAQs

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