Features:

  • Adjustable height for all TOTO toilet tanks
  • Resets your tank back to optimal performance
  • Includes valve, refill tube and clamp, cone washer and nut
  • Standard 7/8 inch inlet connection
  • Easy, DIY installation
Finally, a fix for that nearly new yet leaky Toto toilet

I bought three new Toto toilets just 2 years ago and one of them started leaking (in the tank so not a leak that makes a mess) several weeks back. Turns out that the float that shuts off the water after a flush no longer turned off the water so it would just drip a bit, or run a bit, or make a really loud pressure noise at times (like the middle of the night when you need a really odd, loud, unfamiliar noise the most). A little research showed that this is a pretty common problem with some Toto's (Toto Carlyle II model in our case) and this is the universal fill valve that replaces many Toto fill valves. This one on Amazon was about half the price of the Toto website and it came in a genuine Toto box so all looks legit. The Toto directions are mostly clear and you could do most of the job without any directions, it's pretty much common sense. But, you need to lookup your toilet model number on the directions to know what height to set it at (it's adjustable) and how much to set the water pressure knob at (it comes with a key you use to set that). It's that key that isn't clearly explained but you basically find your number on the chart, find that number on the key, place the key into the knob and turn it until a it hits the key...essentially you are using the key to set a gap. Once you understand that it's all quite easy and you'll have it replaced in 10 minutes. No tools are needed to put in the new valve but you may need a wrench to get the old nut off the old valve when pulling out the old unit. Other than that it's easy and has worked great ever since I installed it.

This is model 528 fill valve with an added water refill adjuster - see troubleshooing tips

This is a genuine Toto fill value stamped with "ANTI SIPHON 528" which is pretty much an exact part replacement for the fill value that originally came with my Toto toilet. What looks different from the kit from my original is that the water tube is clear (instead of black), comes with a black mounting nut (instead of hex white nut), and the water tube port has an added refill adjuster dial part that allows you to adjust the water flow rate. The refill adjuster part is what allows this fill value to be marketed as universal, since most fill valves are adjustable in height. I've tried setting my refill ratio to 3 as stated on the chart for my model, but what I've noticed is that it simply reduced the water flow rate, so I've opened the dial fully to maximize the water flow just as in my original 528 for my toilet. I ended up getting the refill valve after a series of toilet malfunctions which started with water constantly running at the top of the fill value. If this is your problem, first try replacing the valve cap with diaphragm (part THU123). This is the most common point of failure for Toto fill valves. I've tried the inexpensive Korky R528 Replacement Cap Assembly part and it fit perfectly on my Toto fill valve assembly. I found a youtube video on Toto maintenance, and also cleaned the fill valve float ball along with other internal parts. After that problem was fixed, I then noticed that the flush flapper started not sitting tight after some flushes. The rubber looked like it was warped and disintegrating, sticky and gummy to the touch. I replaced it with Korky 2021BP G-Max Flapper For TOTO Toilet Repairs and that worked perfectly as well to stop another water leak issue. I thought my problems were over, but then the toilet tank started leaking on the outside, which damaged the floor board next to the toilet! I tried replacing the red rubber 'shank gasket' that sits at the bottom of the fill valve and also replaced the black rubber tank bolt washers that also looked like they were melting away. I was able to find the parts at local HD -- Fluidmaster 250 toilet fill valve installation parts along with standard toilet bolt washers. Even with these replacements, the toilet tank was still leaking slowly, so I called the Toto manufacturer and the CSR asked me if I had ever used chlorine tablets for the toilet tank. Apparently, whenever Toto had ever dealt with these toilet rubber parts failures, these tank cleaning tablets have been involved. I had not used them, but I know the previous home owners did for my recently purchased house. So, please STAY CLEAR OF EVER USING TANK CLEANING TABLETS and you will avoid premature death of all the internal toilet rubber mechanisms. If you must, you can use the tablets that mount at the toilet bowl level, or simply perform old-fashioned and most effective manual scrubbing. I noticed that the tank slowly leaked around the top of the mounting nut only when the water was turned on. The tank didn't leak even with the tank full of water when the water supply (pressure) was shut off so I suspected the fill valve casing integrity problem instead of any rubber gaskets. I did make sure that my leak wasn't coming from the water supply line connection right below the mounting nut, but this can be another source of water leak that you may want to verify. I ended up purchasing the Toto fill valve after all the sticky rubber parts got replaced one by one (which I don't regret, and I did save the Korky R528 for future), and I was simply tired of fooling around with my toilet problems. Part of the issue may have been the hex plastic mounting nut which looked a bit warped, so I happily used the black mounting nut that came with the kit instead. This did finally resolve all of my toilet issues, and I hope you benefit from my unfortunate Toto toilet troubleshooting adventures.

Easy Valve Replacement for my 10-year old TOTO Toilet (ST743S)

After about 10 years, my TOTO ST743S began filling erratically; the water would turn on and off for the last 4-5 seconds until it reached the fill line. I assume this was an issue with the fill valve, and since I had got 10 years out of the original fill valve I elected to replace the entire assembly versus trying to replace the round diaphragm at the top of the valve (which is an option; about $7). The installation instructions are pretty straight forward; you need to determine which model TOTO you have to set the correct height and put the locking insert in place (TOTO Models are stamped on the inside back of the toilet by the top). I only needed to cut about 2 inches off the supplied vinyl hose. The kit comes with everything you need with the exception of some scissors and an open wrench. The open wrench is helpful to make that last 3/4 turn on the nut the attaches the valve assembly to the bottom of the toilet (be careful not to over tighten). The nut that attaches your water line to the valve assembly should only be tighten by hand (DON"T USE A WRENCH OR TAPE). The new fill valve has been working great. Like most Amazon shoppers, I count on honest, unbiased reviews. I hope you have found this review helpful in making your purchase decision.

Quality valve for your Toto

A USA-made valve for your Toto-USA toilet. It says "Toto" on the top, and "Lavelle" on the side. Lavelle sells this part directly under the "Korky" brand, #528MP. For $10 less you don't get the Toto instructions, but you simply set the tube length so the waterlevel mark is at the right height for the tank (usually a line, or a distance below the overflow) and adjust the refill valve to get the right amount of water in the bowl. The Korky 528GT ("Genuine Toto") comes with the instructions, but costs more. Search YouTube for the 528GT video which ever valve you use.

WARNING: Good product, but DON'T follow Toto directions. MEASURE!

This a well made, easy-to-install replacement, but be warned: DO NOT FOLLOW the enclosed Toto model tables. MEASURE the height from the valve seat at the bottom of the toilet tank to the actual fill line (1/2" below the top of the overflow tube) and set the height of the replacement valve by that for correct operation. On one of two toilets, the Toto table specified 4 "pegs" which would have filled the tank less than half way, on the other, it specified 10 "pegs", which would have flooded over the top of the overflow tube. The number of pegs to match the original equipment and bring the water in the tank to the correct height was 9 "pegs". Note also, once installed, adjusting the in-tank water level would be very challenging without taking it out and reinstalling, so get it right the first time.

Quick to ship, easy to install

I've tried it all... followed the YouTube videos on disassembly and cleaning. Tweaked the adjustments. Finally gave up and bought this valve. Should have just started there. We have really hard water, and the mineral deposits just get the better of the valves. Had a plumber replace this one about five years ago for upwards of $100, and it turns out he didn't even do it right. For $28 and about 10 minutes...all problems solved! Buying two more to replace the rest of our leaky valves now.

Can't go wrong with a genuine Toto replacement fill valve.

Nothing like OEM replacement parts. You can't beat the quality of an OEM item. Packaging was good and all parts were very well constructed and well fitting. All parts necessary were included, including a few I didn't need. This is Toto's universal fill valve that I was replacing the leaky Power Gravity feed unit. Size is and adjustability is OEM. What makes this universal is the waterline adjustments and the bowl fill adjustability. Instructions come with the settings to use for the bowl fill based on your model number. If your like me, you don't know what model number your Toto toilet is and you'll just have to guess on the setting for the bowl fill, which is control by a little knob before the fill line into the bowl. The unit comes with what looks like a feeler gauge to determine how far you turn the knob which controls how much water goes into the bowl on each flush. I used a 4 setting and it filled the bowl with a bit more water than normal. I simple gave the knob a slight turn counterclockwise to fill a bit less water. Easy to adjust, no real need for the gauge other than to get you in the ballpark. The whole fill process is a bit quieter than the stock Power Gravity unit it replaced.

Works Great: Same As Korky 528GT

The hardest part of installing this fill valve is getting all the water out of the tank. The instructions are very clear & the install was very easy. No tools were required to install the valve, but you might need a channel locks to remove old nut from your existing fill valve; depending on what you have. Even though Toto is on the box & says OEM, the valve is made by Lavalle, who also makes Korky, & their part number is 528. This info is even on the valve body along with made in USA. This particular model has a small adjustable valve that lets you control how much water goes into the toilet bowl. The tank water is controlled by the height adjustment of the fill valve stem. The longer you make it, the more the tank will fill. Make it shorter & the tank fills less. They explain how to do this in the instructions. If you actually read the instructions, the install will be easy.

Replacing my flush valve was fast and easy!

When my older Toto toilet started emitting a high-pitched wail as it finished filling, I phoned Toto and learned that I needed a new fill valve. Happily the customer service rep was able to give me the model number of a universal valve to replace my old one and I easily located one on Amazon from PlumberStock. It arrived faster than expected with free shipping and was complete with step-by-step instructions. The only tool I needed was a wrench to loosen the old valve nut, and the new installation was very easy. The new valve from Toto is universal for their toilets. You match a number on the inside of the tank to select the correct tube length and fill level. The only confusing part was finding the place to put the fill adjustment disk. When I was done, the toilet flushed and filled properly with no leaks and the wail was gone. And the good news is that the new valve can be cleaned out so if the wail returns, cleaning and not replacing may be all that is needed.

Works on a One Piece Toto - Universal for every Toto model

Just installed this on a one piece Toto Ultramax and it worked perfectly! I was concerned because the description says it is for a two piece toilet so I called Toto technical support and they confirmed that this is the universal replacement for all models. If you want to see what is involved Toto has a video posted on YouTube that explains exactly how to install this - just search for "How to Replace TOTO Universal Fill Valve". It is very clear in showing each step and was a big help. The paper instructions have a grid that tells you exactly how to customize the fit for every model and it is very easy. One other tip that may be useful is to run hot water over the end of the plastic overflow tube to warm it and that makes it is much easier to slip it on to the connections.

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