Fluidmaster K-400H-039 High Performance Toilet Fill Valve with 2-Inch Adjustable Toilet Flapper Kit

Excellent product at a good price. I installed it and works fine. Very good instructions. These last a long time.

Before installing this, the toilet had a certain sound. Inconsistent. Slightly drawn out. Just enough to notice every time. After installing this, that sound changed. The refill became quicker, smoother, and more controlled. No weird noises, no hesitation—just a clean, efficient cycle that finishes without dragging on. Installation was straightforward, adjustments were easy, and once it was set, it stayed consistent. You don’t think about it often—but when something works this smoothly, you notice the difference.

Worked like a champ. Easy to install and dial in without a youtube video even lol. Saw another reviewer mentioning the flapper didn’t fit because he bought a 3” and needed a 2” but didn’t know where to measure. Well, logic would dictate it being the hole it’s plugging, right? Perhaps? Just maybe? Just lift the flapper, eyeball the opening it was plugging. If it’s the size of an Oreo, you got a 2”. A baseball, you got a 3”. If your toilet was made after 2000, it could be a 3”. But before 2000, more than likely a 2”. If you’re uncertain, they make versions of this item without the flapper and you can purchase that part separately or as needed. As for measuring it? Use the ruler app on your phone to estimate without sticking a tape measure in your refill container. (Wink). That said, the flush is much stronger now, there were no leaking after install. The build quality seems fine, and these are inexpensive enough to not expect decades of use. My only complaint is the plastic or rubber tube to connect the water was a bit shorter than my previous one and interfered with the flush lever, so I had to use my previous one which was fine. I mentioned that specifically because some users described having to cut the included tube to make it shorter. In my case the reverse was true and mine was too short. Pause. All in all, a simple, inexpensive fix and I think I’ll replace the others in my house as well so they can race to see which lasts longest. Lol. 10/10 would recommend.

The directions could be better, but it installs pretty easy and works very well once you get passed a few head scratchers

Your not flushing away your money with this. Great product at a great price. Reliable and easy installation. No tools necessary.

I used this to replace the old type with the arm and the ball at the end. With the old one I was always bending or tightening the ball to get the correct water level (I need to say that this original part was very old and should have been replaced long ago.) The adjustments are knobs on the unity and are easy to manipulate. The new one went in without a hitch and is operating efficiently and I think it will continue to work for a long time.

got this to replace / upgrade the fill valve that was having issues not shutting off properly. Install was simple, straight forward. These work GREAT, refills are quiet and accurate. Will be buying more when the time comes to replace others in our home

Works as advertised and easy to install

Muy buen producto, fácil de instalar, y muy silencioso trabajando. Todo está en el paquete para hacer una buena instalación. Material impecable.

Worked great super easy install. Has lots parts that can help replace any worn out ones.

Muito bom

This was very easy to install and works great.

Funciona bien!