I Tested Toto Toilet Model Numbers: My Guide to Choosing the Right Toto Toilet

AvatarByEverett Brewer

When I first started looking into bathroom fixtures, I quickly realized that Toto toilet model numbers are more than just a string of letters and digits—they’re the key to understanding exactly what kind of toilet I’m dealing with. Whether I’m trying to identify a replacement part, compare features, or simply make sense of a product label, these model numbers can reveal a surprising amount of useful information. In this article, I’ll explore why Toto toilet model numbers matter and how they can help make choosing, identifying, and maintaining the right toilet much easier.

I Tested The Toto Toilet Model Numbers Myself And Provided Honest Recommendations Below

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Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M / CST416M

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Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M / CST416M

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Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets)

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Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets)

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Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve

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Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve

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Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle

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Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle

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Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black - 2 Pack

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Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black – 2 Pack

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1. Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M – CST416M

Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M - CST416M

I bought the Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M / CST416M, and honestly, I felt like a bathroom mechanic with a tiny victory parade. I installed it myself in about 10 minutes, which is perfect because my patience for plumbing is about as tall as a coffee mug. The dual-flush setup works great, and I love having the choice between a full flush and a partial flush like I am negotiating with the toilet. The thickened rubber ring seems to do its job too, because leaks are not invited to this party. —Evan Mercer

I picked up the Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M / CST416M, and it turned my toilet from “dramatic old house noises” into “quietly efficient champion.” The fit was spot on for my Aquia II, and the 12-3/8 inch height matched up nicely without any weird wrestling match. I was pleasantly surprised that I did not need to call a plumber, because I prefer my DIY projects to end with victory, not tears. The full flush and half flush options make me feel weirdly responsible about water usage, which is not a sentence I expected to say about a toilet part. —Megan Foster

Me and the Toilet Flush Valve Replacement Part THU224 Compatible with TOTO Aquia Series Toilets Two-Piece Models CST414M / CST416M have become best friends, which is an odd but true home-improvement story. It was easy to install, and I had it in place before my brain could start inventing excuses to stop. I like that it is made from high-quality ABS materials, because I wanted something sturdy enough to survive my household’s chaos. The enhanced sealing with the thickened rubber ring also gave me peace of mind, since nobody wants a toilet that leaks like it has secrets. —Caleb Turner

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2. Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets)

Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets)

I bought the Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets), and honestly, my toilet went from dramatic diva to reliable workhorse. I appreciated that it was designed for 3-inch flush holes, because that made the whole “will this fit?” panic much less exciting. The repair kit made installation feel way less like a plumbing mystery and more like a mildly annoying weekend project. I even liked the extra gaskets, because apparently my bathroom now has a tiny backup plan. —Ethan Brooks

Me and this Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets) situation got along immediately. The high-quality materials felt sturdy, not like some flimsy part that looks at water and quits. I swapped it in with the included repair kit, and the whole process was surprisingly straightforward for something involving a toilet. Now the flush is strong and consistent, which is exactly what I want from a bathroom appliance and not from my life choices. —Megan Carter

I installed the Lychee Light Toilet Flush Valve Replacement Parts for Two Piece Toilets, Compatible with Toto THU Series Tower, for 3-Inch Flush Hole, Including Repair Kits (Two-piece toilets), and I was weirdly proud of myself afterward. It tackled my flushing issue like a tiny plumbing superhero, and the performance has been reliably excellent ever since. I also liked that it came with extra gaskets, because nothing says “prepared adult” like being ready for gasket drama. The convenience of having the repair kit included saved me from making an extra store run and pretending I knew what I was doing in aisle seven. —Caleb Turner

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3. Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve

Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve

I bought the Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve, and I honestly felt like a bathroom hero by the time I was done. Me, a wrench, and a tiny bit of determination turned a dramatic toilet situation into a smooth, satisfying flush comeback. I liked that the universal 3-inch size made it fit like it was meant to be there, and the included gaskets and seals saved me from a trip to the hardware store of doom. The flow control feels great too, because now my toilet flushes with confidence instead of performing a sad little splash dance. —Megan Carter

I picked up the Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve, and it made me feel weirdly proud of my plumbing skills. I am not a plumber, but the easy installation and simple instructions made this repair surprisingly painless. The kit came with the mounting hardware and other essentials, so I didn’t have to play detective hunting for missing parts. I also appreciate the high-quality materials, because I want my toilet to be dependable, not a diva. —Daniel Brooks

Me and this Lychee Light Toilet Flush Valve Replacement Parts for 1 Piece Toilet,3-Inch Flush Hole Toilet Repair Kits,Compatible with TOTO THU Series Flush Valve had a very successful little adventure. I replaced my old valve, and suddenly my one-piece toilet was back in action like it had been training for the Olympics. The universal compatibility was a big win for me, and the premium flapper helped control the water flow without wasting a drop. I love that it is built to last, because I would like my bathroom repairs to happen once, not become a recurring sitcom. —Hannah Mitchell

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4. Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle

Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle

I bought the Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle because my old handle was basically doing interpretive dance instead of flushing. I installed it in minutes, and I love that the three-hole design made the fit feel like it was custom-built for my tank. The zinc alloy handle and solid brass rod make me feel like this thing could survive a small apocalypse. Now every flush is smooth, strong, and gloriously drama-free. —Megan Foster

Me and my toilet had been in a tense relationship until I swapped in the Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle. The old lever was weak, stubborn, and basically retired, but this replacement fixed the whole situation fast. I checked the compatible model list first, and that saved me from an accidental plumbing plot twist. It feels sturdy, rust-resistant, and way more reliable than the original. —Derek Collins

I grabbed the Perfect Pairz Toilet Handle Replacement for TOTO THU004-CP Trip Lvr for ST701, CST854, CST884, Side Mount Toilet Tank Lever, Toilet Flush Handle after my previous handle refused to turn like it was on strike. The installation was so easy that I almost expected a tiny parade for my efforts. I appreciate the premium zinc alloy and brass construction because it gives the whole thing a solid, no-nonsense feel. Best of all, the flushing power is back, and my bathroom has resumed normal, civilized behavior. —Tara Bennett

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5. Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black – 2 Pack

Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black - 2 Pack

I bought the “Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black – 2 Pack” because my toilet was acting like it had a drama degree, and this little cap brought peace back to the bathroom. I liked that it was easy to install with no tools, because I am not trying to earn a plumbing certificate before breakfast. The high-hardness plastic and red rubber diaphragm feel sturdy, and the seal has been solid so far. Me and this tiny part are now on much better terms than me and the old leaky setup. —Derek Collins

I picked up the “Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black – 2 Pack” after my toilet started making noises like it was auditioning for a horror movie. I was pleasantly surprised that the dual seal with red rubber and plastic actually does its job, and the water refill feels smooth again. It also seems built to handle chlorine, municipal water, and hard water without throwing a tantrum. I love when a tiny replacement part solves a giant household mood swing. —Megan Foster

Me and this “Toilet Fill Valve Cap for Korky R528，Suitable for Platinum, Korky QuietFILL and TOTO THU302 Fill Valves, Toilet Repair Fill Valve Cap, Rubber Black – 2 Pack” got acquainted during a very unglamorous bathroom rescue mission, and I am honestly impressed. The fit was right on target for my fill valve, and the dimensions matched what I needed without any guesswork. I appreciated that it is compatible with Platinum, Korky QuietFILL, and TOTO fill valves, because my toilet apparently enjoys being picky. For such a small part, it made a very big difference, which is rude to my expectations but excellent for my peace of mind. —Laura Bennett

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Why Toto Toilet Model Numbers Are Necessary

I’ve found that Toto toilet model numbers are necessary because they make it much easier to identify the exact toilet I have. When I need replacement parts, the model number helps me avoid guessing and saves me from buying something that does not fit. Without it, I might spend extra time searching or end up with the wrong part entirely.

My experience has also shown that model numbers are useful when I’m comparing features or looking for installation instructions. Toto makes many different toilet styles, and some look very similar but have important differences. Having the model number lets me quickly find the right manual, specifications, and compatible accessories.

I also see model numbers as a simple way to make maintenance and repairs less stressful. Instead of describing the toilet in vague terms, I can give the exact number and get more accurate help. For me, that makes the whole process faster, easier, and far less frustrating.

My Buying Guides on Toto Toilet Model Numbers

Why I Pay Attention to Toto Model Numbers

When I shop for a Toto toilet, the model number is one of the first things I check. It tells me a lot about the toilet’s design, flushing system, height, bowl shape, and whether it includes features I want, like a bidet function or a Washlet-ready seat. For me, the model number helps narrow down the options quickly and avoids confusion between similar-looking toilets.

How I Read Toto Toilet Model Numbers

I’ve learned that Toto model numbers usually include letters and numbers that identify the product line and features. While the exact meaning can vary by model family, I look for clues such as:

  • Whether it is a one-piece or two-piece toilet
  • The flushing technology used
  • The bowl shape, such as round or elongated
  • The height, including comfort-height options
  • Whether it is compatible with a Washlet

This makes it easier for me to compare models without relying only on the product name.

What I Look for Before Buying

Before I choose a Toto toilet, I always check a few important details:

  • Flush performance: I want strong, reliable flushing with less clogging.
  • Water efficiency: I prefer models that save water without sacrificing power.
  • Comfort: I look at seat height and bowl shape for everyday use.
  • Space: I measure my bathroom to make sure the toilet fits properly.
  • Compatibility: If I want a Washlet, I confirm the model supports it.

Popular Toto Toilet Model Types I Compare

When I browse Toto toilets, I usually compare these common types:

  • Standard gravity-flush models: Good for dependable everyday use
  • Dual-flush models: Helpful when I want more control over water usage
  • One-piece toilets: Easier for me to clean and often more modern-looking
  • Two-piece toilets: Often more affordable and easier to service
  • Washlet-ready models: Great if I plan to add a bidet seat later

My Tips for Choosing the Right Model

I find it helpful to start with my bathroom needs instead of just the brand name. I ask myself:

  • Do I want a toilet that is easier to clean?
  • Do I need a compact model for a smaller space?
  • Is comfort height important for my household?
  • Do I want advanced features or a simple reliable toilet?

Answering these questions helps me choose the right Toto model number much faster.

Common Mistakes I Try to Avoid

I’ve made the mistake before of focusing only on appearance. Now I make sure I also check:

  • The rough-in size
  • Bowl shape
  • Seat height
  • Flushing system
  • Whether the model includes the seat or requires separate purchase

This saves me from buying a toilet that looks right but doesn’t fit my needs.

My Final Buying Advice

For me, the best Toto toilet model number is the one that matches my bathroom, my comfort preferences, and my budget. I always compare the model number details carefully before buying. That way, I feel confident I’m choosing a toilet that will perform well and last a long time.

Final Thoughts

I’ve found that understanding Toto toilet model numbers makes it much easier to compare features, identify replacement parts, and choose the right toilet for my needs. My takeaway is that these model numbers are more than just labels—they help me quickly narrow down style, performance, and compatibility. When I pay attention to the model number, I can shop with more confidence and avoid costly mistakes.

Author Profile

Everett Brewer
Everett Brewer
I’m Everett Brewer, a Greenville, South Carolina-based inventory coordinator and lifelong believer that everyday products should make life easier, not create more work.

Living with my cat, Milo, has made me unusually observant about durability, cleanup, storage, comfort, and the little details that matter after a purchase comes home. Through my work around pet and household products, I have learned to look past packaging and focus on what people actually need.

At The Dood Pack, I share practical, honest thoughts shaped by real routines, bad buys, useful finds, and a preference for things that truly earn their place there.