Toto THU500S Replacement Flapper for Select 3 Inch Flush Valve Tanks, Red (2 Pack)

The cheap Chinese substitutes don't hold a candle to these. I'll only use these from now on. They don't leak and hold up very well.

I have two Toto Drake low volume flush toilets, installed 10 years ago. If I recall, the flapper valves needed replacing at 5 years. Thinking to save some money, i bought aftermarket parts from big box stores or amazon - at about 2 year intervals! Not only did the aftermarket kits fail to last very long before leaking, they didn't flush as well as the Toto units. I didn't notice this at the times I installed the valves, just that they seemed to flush more slowly than the Toto flappers and fill to somewhat variable levels in the bowl. The Toto flapper valves, however, flush much more quickly, and seem to fill the bowl to the same level each time. In fact compared to the last flappers, the Toto units flush as if they were under high pressure! So, trying to save money I bought 3 aftermarket kits in 5 years, instead of 1 Toto unit (which hopefully lasts as long as the original.) Just spend a bit extra up front - it saves in the long run.

Our toilets are about 40 years old and, as to be expected, we have had to replace flappers periodically. We’ve never had any problems with these Toto flappers. They’re genuine Toto parts and come factory sealed. They are easy to install and put an end to “phantom flushes” and slow leaks until normal wear and tear combined with our very hard water causes them to wear out. Don’t waste your money on generics. We tried and found they never quite fit properly and so they didn’t form a good seal. Lesson learned, we went back to Toto parts.

Decided to try this model instead of original because it looks sturdier and will last longer. Difference is the raised center. Installation is easier with the split sides which snap on to the mounting posts. The original lasted 2 years with heavy use so only time will tell.

The original TOTO design was all rubber, and would typically last 3-4 years before starting to deform and deteriorate. You would know it was short for life when you would begin to see a red residue at the water level within the toilet bowl. This was basically some of the red rubber deteriorating off of the tank flapper. You need to look inside the water tank to see what model TOTO toilet you have. Then carefully look at the back of the packaging to figure out how to setup this flapper. There are three setting that you must adjust. The size of the openings in the bulb of the flapper, the number of chain links used, and the location of the chain hook on the flushing lever. I left the Longevity blank for now, as only time will tell if this design lasts longer then the original all rubber design.

I'd never done this before, but it was easy enough. I replaced the clapper on a Toto Drake 2 (CST 744S). If it was listed on the back of the package, as many are, I could not find it. The print was too small for me to read, but I took a picture with my camera. In any event, the hardest part of this install was 1) cutting off the old clapper, and 2) getting the chain length the right amount. This new clapper just snaps into place, and other than the two points, the install is super-easy. Overall, if you have two hands you can do this.

I've had to replace these about once a year. While it is easy to do, and not that expensive, it is a pain in the neck.

Had to buy a pair to get one in short order; the single would have taken a month to arrive with the current priorities. Last replaced the flapper in 2014, so these last a while. This is easier to install than the original THU175S because the ears simply clip onto the arms of the flush valve while the original had holes that had to be hooked over the ears on the arms on the valve. Comes with a chart for adjusting it depending on the toilet model, which is usually found on the inside back wall of the tank. Mine required no configuration adjustment. No more tank refilling every few minutes.