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Toto S5 Washlet with Remote - Elongated in Cotton White

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TOTO Flush Valve Tower Compatibility & Replacement Guide

A TOTO toilet that keeps running, or starts trickling again a few minutes after jiggling the handle, almost always points to one part – the flush valve tower. TOTO moved away from traditional rubber flappers toward canister-style flush towers to get a stronger, more efficient flush while cutting down on the maintenance headaches flappers are known for. The tower design releases water quickly and evenly through a wider opening instead of relying on a flapper hinge to swing clear in time. Finding the right replacement part can trip people up because TOTO has produced this unit in more than a dozen sizes and thread patterns across its lineup. A tower pulled from a Drake won't drop into an Aquia IV tank no matter how similar the two look sitting side by side. The chart below sorts through that: find your toilet series, and you'll land on the exact tower and gasket it takes, current or discontinued, before you order anything. 💡 Pro Tip Not sure how to read your toilet's model number? Our guide on finding your toilet's model number walks through exactly where TOTO stamps it, and that number is what you'll match against the chart below. Understanding TOTO Flush Tower Components A TOTO flush tower system is made up of a handful of parts that usually get replaced together or in the same repair visit. Knowing what each one does makes it a lot easier to diagnose what's actually failing. The tower/canister: the tall plastic cylinder that sits in the center of the tank and lifts to release water into the bowl when you flush. The drain valve: the base unit the tower sits on, which threads into the bottom of the tank through a large mounting nut accessed from underneath. The seal gasket: a rubber ring on the underside of the tower or drain valve base that keeps water from seeping past when the tower is seated. This is almost always the actual point of failure in a running toilet. The fill valve: a separate component that refills the tank after each flush. It's not part of the tower itself, but TOTO often documents it alongside flush tower parts since both live inside the tank and get serviced around the same time. The trip lever and actuator: the mechanism connecting your flush handle to the top of the tower, which lifts it to start the flush. Most residential leaks and running-toilet complaints trace back to the seal gasket rather than the tower itself, which is why we've listed the correct gasket alongside each flush tower below. 💬 Before You Buy Talk to Our Team First Have questions about pricing? Give us a call! Our team loves finding the best deal for you. Contact us → Office hours are Mon-Fri, 8:30 AM - 4:30 PM ET. TOTO Flush Valve Tower Compatibility Chart Match your toilet model to the correct flush valve tower and gasket below. Flush towers are grouped by toilet series rather than by every individual model number, so if your exact model isn't named here, it's almost certainly part of one of these families. Note: where TOTO's documentation didn't list a specific gasket SKU for a part, that typically means the tower and its seal are sold only as one complete assembly rather than as separate replaceable pieces. Current / Available TOTO Flush Valve & Tower Applications TOTO Toilet / System Series Model Numbers Replacement Flush Valve Tower Replacement Gasket Potential Replacement(s) DrakeEntradaClayton Drake: CST743S; CST744S; CST744SG; CST744SB; CST744SDB; CST744SF.10; CST744E; CST744EN; CST744ERN; CST744EGN; CST744ERGN Entrada: CST243E; CST244E Clayton: CST784SF MPN: THU443.10B-A SKU: TOTTHU44310B-A MPN: THU407 SKU: TOTTHU407 Potentially replaces THU129P-4A; THU129W-4A GuinevereEco Lloyd Guinevere: MS974224CEF; MS974224CEFG; CST974CEF; CST974CEFG; CST974CEFGAT40 Eco Lloyd: MS934214EF; CST934EF; CST934EFT MPN: THU861-A SKU: TOTTHU861-A MPN: THU407 SKU: TOTTHU407 Potentially replaces THU249W-1; THU249P-1; THU453.6B-A CarolinaSupremeEco Supreme Carolina: MS884114; CST884 Supreme: MS863113; MS864114; CST863; CST864 Eco Supreme: MS863113E; MS864114E; CST863E; CST864E MPN: THU800-A SKU: TOTTHU800A MPN: THU407 SKU: TOTTHU407 Replaces THU460.6D-A; THU001Z; THU128Z-1; THU245P-3 UltraMax 1.6 GPFEco UltraMax 1.28 GPFSoirée 1.28 GPFLegacy THU453.10C-A Service Families UltraMax 1.6 GPF: MS853113; MS854114S; MS854114SG; MS854114SL; MS854114SLR; CST853S; CST854S; CST854SG; CST854SL; CST854SLR Eco UltraMax 1.28 GPF: MS853113E; MS854114E; MS854114EG; MS854114EL; MS854114ELG; MS854114ELR; CST853E; CST854E; CST854EG; CST854EL; CST854ELG; CST854ELR Soirée 1.28 GPF: MS964124CEF; MS964124CEFG; CST964CEFAT40; CST964CEFGAT40 Legacy THU453.10C-A: CST626/MS626; CST874/MS874; CST974/MS974; CST624/MS624; CST934/MS934; CST604/MS604 MPN: THU850-A SKU: TOTTHU850-A MPN: THU407 SKU: TOTTHU407 Replaces THU453.10C-A Aquia IV One-PieceAquia IV CubeAquia IV Arc Aquia IV One-Piece: MS646124CEMFN; MS646124CEMFGN; MS646234CEMFGN; CST646CEMFNAT40; CST646CEMFGNAT40 Aquia IV Cube: MS436124CEMFGN; MW4363046CEMFGN; MW4363046CEMFGNA; MW4363056CEMFGN; MW4363056CEMFGNA; MW4363074CEMFGN; MW4363084CEMFGN Aquia IV Arc: MS448124CEMFGN; MW4483046CEMFGN; MW4483046CEMFGNA; MW4483056CEMFGN; MW4483056CEMFGNA; MW4483074CEMFGN; MW4483084CEMFGN MPN: THU844-A / THU837-A SKU: TOTTHU844-A / TOTTHU837-A MPN: 9BU112E-A SKU: TOT9BU112E-A No replacements DrakeDartmouthEco Nexus Drake: CST775CEF; CST775CEFG; CST775CEFR; CST775CEFRG; CST776CE; CST776CEG; CST776CEF; CST776CEFG; CST776CEFG.10; CST776CERG; MS776124CEG; MW7763046CEGA; MW7763056CEGA; MW7763074CEG; MW7763084CEG Dartmouth: CST753; CST754 Eco Nexus: CST794EF MPN: THU825-A SKU: TOTTHU825-A MPN: THU407 SKU: TOTTHU407 Replaces THU444.10D-A; THU252P-A; THU252W-2A Drake IIVespin II Drake II: CST454CEF; CST454CEFG; CST454CEFRG Vespin II: CST474CEF; CST474CEFG MPN: THU824-A SKU: TOTTHU824-A MPN: THU407 SKU: TOTTHU407 Replaces THU252W-6A; THU252P-A; THU445.10F-A; THU443.15K-A; THU129P-2A; THU129W-2A; THU129P-6A Legato MS624124CEF; MS624124CEFG; MS624234CEFG; MW6243046CEFG; MW6243046CEFGA; MW6243056CEFG; MW6243056CEFGA; MW6243074CEFG; MW6243084CEFG; CST624CEFAT40; CST624CEFGAT40 MPN: THU780-A SKU: TOTTHU780-A MPN: THU407 SKU: TOTTHU407 No replacements UltraMax II 1.28 GPFNexus One-Piece 1.28 GPFCarlyle II UltraMax II 1.28 GPF: MS604114CEF; MS604114CEFG; MS604124CEF; MS604124CEFG; MS604124CEFRG; MW6043046CEFG; MW6043046CEFGA; MW6043056CEFG; MW6043056CEFGA; MW6043074CEFG; MW6043084CEFG; CST604CEF; CST604CEFG; CST604CEFAT40; CST604CEFGAT40 Nexus One-Piece 1.28 GPF: MS642124CEF; MS642124CEFG; MS642234CEFG; CST642CEFAT40; CST642CEFGAT40 Carlyle II: MS614124CEF; MS614124CEFG; MS614124CEFRG; CST614CEFAT40; CST614CEFGAT40; CST614CEFRGT40 MPN: THU747-A SKU: TOTTHU747-A MPN: THU407 SKU: TOTTHU407 No replacements Nexus Two-Piece MS442124CEF; MS442124CEFG; MS442234CEFG; MW4423046CEFG; MW4423046CEFGA; MW4423056CEFG; MW4423056CEFGA MPN: THU652-A SKU: TOTTHU652-A MPN: THU407 SKU: TOTTHU407 No replacements DuoFit In-Wall Tank Systems WT172M; WT173M; WT173MA MPN: THU753R-A SKU: TOTTHU753RA N/A — whole assembly replacement needed No replacements Maris CST484CEMF; CST484CEMFG (tank ST484M) MPN: THU356 SKU: TOTTHU356 MPN: THU440-A — Discontinued, no longer available No replacements DuoFit In-Wall Tank Systems WT151M; WT152MCompatible Aquia wall-hung bowls: CT418F; CT418FG MPN: THU322-A SKU: TOTTHU322-A MPN: 9BU112E-A SKU: TOT9BU112E-A No replacements AquiaAquia LegacyAquia IIAquia III Aquia: CST412MF; CST412MF.10; CST414M Aquia Legacy: CST413M Aquia II: CST416M Aquia III: CST464MF MPN: THU435 SKU: TOTTHU435 MPN: 9BU088E SKU: TOT9BU088E Replaces THU224 Connelly MS494124CEMFG; MS494124CEMFRG; MS494234CEMFG; MS494234CEMFRG; MW4943044CEMFG; MW4943044CEMFGA; MW4943054CEMFG; MW4943054CEMFGA; CST494CEMF; CST494CEMFG; CST494CEMFR; CST494CEMFRG MPN: THU779-A SKU: TOTTHU779A MPN: 9BU112E-A SKU: TOT9BU112E-A No replacements DuoFit In-Wall Tank Systems WT151M; WT152MCompatible Aquia wall-hung bowls: CT418F; CT418FG MPN: THU134 SKU: TOTTHU134 N/A — whole assembly replacement needed No replacements TOTO In-Wall Tank Systems WT172M; WT173M; WT173MA; WT174M; WT175MA MPN: TSU46AR SKU: TOTTSU46AR N/A No replacements Universal TOTO Fill-Valve Application TSU99A.XR is published by TOTO as a Universal Fill Valve Assembly; no finite toilet-model list is published. MPN: TSU99A.XR SKU: TOTTSU99A.XR N/A Replaces TSU06A.4; TSU07A.5; TSU08A.5; TSU08A.6; TSU08A.6R; TSU08A.11; TSU09A.7; TSU09A.8; TSU09A.13; TSU14A; TSU16A; TSU16A.4; TSU17A; TSU18A; TSU22A.11; TSU24A; TSU25A; TSU28A; TSU29A; TSU30A; TSU31A; TSU34A; TSU36A.6; TSU36A.10; TSU38A; TSU51A; TSU52A; TSU53A; TSU54A; TSU55A Discontinued TOTO Flush Valve & Tower Applications TOTO Toilet / System Series Model Numbers Replacement Flush Valve Tower Replacement Gasket Potential Replacement(s) Drake IIVespin II Drake II: CST454CEF; CST454CEFG; CST454CEFRG Vespin II: CST474CEF; CST474CEFG MPN: THU445.10F-A SKU: TOTTHU44510F-A N/A No replacements listed, discontinued Aquia IV 446-Series ST446EMNA, 1.28 / 0.9 GPF: CST446CEMGN; MS446124CEMFN; MS446124CEMFGN; MS446234CEMFGN; MW4463046CEMFGN; MW4463046CEMFGNA; MW4463056CEMFGN; MW4463056CEMFGNA; MW4463074CEMFGN; MW4463084CEMFGN MPN: THU847-A SKU: TOTTHU847-A N/A No replacements, discontinued Aquia IV 446-Series Legacy ST446EMA, 1.28 / 0.8 GPF: CST446CEMG; CST446CEMFG; MS446124CEMG; MS446124CEMFG; MS446234CEMG; MS446234CEMFG; MW4463046CEMG; MW4463046CEMGA; MW4463056CEMG; MW4463056CEMGA; MW4463046CEMFG; MW4463046CEMFGA; MW4463056CEMFG; MW4463056CEMFGA MPN: THU738N-A SKU: TOTTHU738N-A N/A No replacements, discontinued DuoFit In-Wall Tank System WT171M MPN: THU762R-A SKU: TOTTHU762RA N/A — whole assembly replacement needed No replacements, discontinued If your toilet is old enough that you can't find it in either table, that's a sign parts availability is genuinely limited. Reach out to our team with your model number and we'll look into sourcing your part. How to Replace a TOTO Flush Valve Tower Every TOTO flush valve tower mounts to the tank the same basic way, through a large plastic nut accessed from underneath the tank. That means the replacement process is nearly identical across the whole lineup, whether you're working on a Drake or an Aquia. What you'll need: an adjustable wrench, a bucket or towels for residual water, and the correct replacement tower (and gasket, if your model has one separate) from the chart above. Shut off the water supply at the angle stop behind the toilet, then flush and hold the handle down until the tank empties as much as possible. Remove the tank lid and set it somewhere padded to prevent it from chipping. Disconnect the refill tube from the overflow tube at the top of the old tower. Reach into the tank and release the tower from the trip lever or actuator linkage at the top, then twist the tower counter-clockwise (usually about a quarter turn) to unlock it from the base. Reach underneath the tank and unscrew the large mounting nut holding the drain valve base in place. This is the step most people get stuck on, since the nut can be seated tightly and space under the tank is tight to work in. Lift the old drain valve assembly up and out through the inside of the tank. If your model uses a separate gasket, peel the old one off the underside of the base and set the new gasket in place before installing the new tower. Lower the new tower/drain valve assembly into the tank opening and hand-tighten the mounting nut from underneath. Snug it, but don't overtighten since that can crack the tank. Reconnect the trip lever linkage and the refill tube, replace the tank lid, and turn the water supply back on. Let the tank fill, then flush a few times and check underneath the tank for any drips before considering the job done. If water is still seeping after a fresh install, the most common cause is a gasket that didn't seat flat or a mounting nut that isn't quite snug, not a defective part. 💡 Pro Tip If you're mid-repair and realize your toilet is old enough that parts are getting hard to find, it may be worth comparing the cost of one more repair against a full toilet replacement. Contact us and our team can help you weigh the two. TOTO Flush Tower FAQ What is a TOTO flush valve tower? It's the canister-style component that replaced the traditional rubber flapper in TOTO toilets. It sits in the center of the tank, lifts when you flush to release water into the bowl, and reseats itself to stop the flush and let the tank refill. How do I know which TOTO flush tower replacement part I need? Match your toilet's model number, usually stamped on the underside of the tank lid or inside the tank itself, against the compatibility chart above. TOTO groups its towers by toilet series, so most models fall clearly into one row. What are common TOTO flush tower issues? The most frequent complaint is a toilet that runs constantly or refills itself between uses, which usually means the seal gasket has worn out rather than the tower itself. Weak flushing and a tower that won't fully reseat after a flush are the next most common issues, and both are usually linked to the trip lever linkage rather than the tower. Can I replace just the gasket instead of the whole flush valve tower? In many cases, yes. Most current TOTO flush tower systems use a separately sold seal gasket (THU407, 9BU112E-A, or 9BU088E depending on your model), and a worn gasket is the most common point of failure. Some systems, particularly DuoFit in-wall tank units, are sold only as a complete assembly with no separate gasket, which is noted in the chart above. Are TOTO flush valve tower replacement parts interchangeable between toilet models? Not usually. Even towers that look similar are sized and threaded for a specific toilet series, and TOTO has revised part numbers over the years as models were updated. Always match against your toilet's exact series or the number stamped on your existing part rather than assuming a similar-looking tower will fit. Get the Right Flush Tower the First Time A leaking or weak-flushing TOTO toilet is one of the more straightforward repairs you can do yourself, as long as you start with the correct part. Grab the tower and gasket that actually match your toilet, and the repair that felt like a mystery an hour ago turns into twenty minutes with a wrench. If your model isn't listed here, or you're not sure which of two similar part numbers applies to your toilet, reach out to our team. We're an authorized TOTO dealer and can help confirm the right part, whether that's by phone at 888-682-5956, email at contact@plumbingdeals.com, or live chat.