Your cart is empty.
Your cart is empty.Product Description
The #1 solution to fix noisy and running toilets, the Fluidmaster 400CR Toilet Fill Valve and Toilet Flapper Repair Kit is a complete fill and flush toilet repair kit that includes both the trusted Fluidmaster 400A toilet fill valve and the durable Fluidmaster 501 2-inch flapper. Perfect for a DIY upgrade with its fast and easy installation, the universal design fits most 2-inch flush valve toilets and works best with 1.6 to 3.5 gallons per flush toilets or larger to help solve most common toilet fill problems. The included 400A toilet fill valve anti-siphon design adjusts easily from 9 – 14 inches while the reliable 501 2-inch flapper features a solid frame build and corrosion resistant materials to help prevent leaks. For an even more optimized performance, consider combining with a Fluidmaster automatic toilet bowl cleaner..
From the Manufacturer
Fluidmaster is the #1 toilet repair brand in the world. Since 1957, we have been guiding our customers to the right toilet repair solutions. Fluidmaster is dedicated to making the installation of its products easy and simple with a complete line of toilet repair parts including: fill valves, single and dual flush valves, flappers, tank levers, toilet seals (bowl wax and wax-free), toilet repair kits, flush valve seals, connectors and more. Fluidmaster parts are found in more toilets than all other brands combined. Fluidmaster distributes to over 90 countries and is the trusted brand by toilet manufacturers and professionals worldwide.
LILass
2025-08-20 10:49:13
First off, Amazon has the picture wrong on this. The 400CR is the newer version with the screw type float height adjuster..always, whereas the 400C can be the old (bar and clip adjuster) or new version because Fluidmaster reverted back to using just 400C some time after the design revision. I knew this when I ordered, but for those of you who care, there it is. I've had both the old and new and just prefer the newer design personally, but plumbers don't seem to care either way. They both function exactly the same way.This is by far the best designed, easiest to install and configure, and reliable fill valve available. I've installed it in each of my toilets over the years. It fills fast, fairly quietly and doesn't cause pipe hammer.I finally had to replace one (the older design) because it repeatedly started having issues. I'd had it in the toilet for at least 10 years anyway! First it started running, which was easily fixed with a cap flushing, but then water stopped flowing to the fill tube. The clog was down in the fill valve below the cap and did not stay fixed with a flushing, so I just decided to replace it. They only take a few minutes to replace and the cost is nominal.The flapper that comes with it is of good quality but I haven't used it. It can be installad on round or square fill tubes that have flapper posts on them. (A post ring for fill tube is not included. Looks like the picture of the black part of the flapper is wrong too. It does not have a fill tube ring. It is open ended just with hooks)My one toilet has a flapper with the timing cup on top of it and it's own drain seat insert that it's attached to (555CRP8, also made by Fluidmaster, 555C is the newest version) because the fill tube is too far from the drain and a standard offset on the flapper, as this has, wouldn't center and seal properly.The other toilet still has a firm gray one with a notched plastic "chain" that I installed separately years ago too. If they aint broke, I don't replace them! Flappers are the touchy part.In addition, fluidmaster provides excellent instructions for the DIYers like me, both in the package and on their website, including troubleshooting instructions. Top notch professional company.Highly recommended.
DOROTHY A. LEWIS
2025-07-07 11:58:37
THE FLUIDMASTER K-400A-5004 UNIVERSAL TOILET FILL VALVE AND 2IN. TOILET FLAPPER REPAIR KIT WAS JUST WHAT I NEEDED, EASY TO INSTALL AND GREAT TO HAVE ON HAND FOR FUTURE USE!!!
Aletheia
2025-04-12 18:16:36
Fluidmaster Toilet Fill Valve is GREAT (5 stars) but Flapper is NO Good (3 stars). My 12 year old fill valve was not accurately filling the tank, we had constantly overflow - initially thought it was a flapper issue but then later realized that water in tank was flowing into the overflow valve. Then I knew that it was the fill valve that was bad. After replacing the fill valve no more problems. But the flapper didn't work because it has a notch not a hole, so whenever we flush, the the water current would blow flapper off from the holder. See the picture provided. I guess for certain toilet models it might work, but not mine. So I got another flapper that has a hole, and now it holds well. So all in all, fill valve is great, the instruction is also well written. It works much better than my old one (when it was new).So if you have a fill valve issue, just get Fill Valve separately. Easy to install, and works great! But don't get the Fill Valve & Flapper Repair Kit. If you have a flapper issue, get a separate flapper from your hardware store. Highly Recommended!
Bookwyrm
2025-03-10 16:32:32
I'm a complete amateur - meaning I never did this before...So I thought...well I could try this and maybe avoid an expensive call to a plumber. I mean honestly i'd have to call one if I screwed up, but if I did nothing i'd have to anyway to get my toilet fixed- so nothing to lose right? Right! So I bought this kit and it was really pretty easy. If you are like me and it's your first time let me offer this advice - save the old unit you pull out. For a few reasons. Reason #1 - you can use it to make sure the pull chain for the new flapper is the right length and that saves you trial and error to get it just right. Reason #2: the height of the unit needs to be adjusted to fit your toilet- if you compare the new to the old this will save you time there as well. Reason #3 - spare parts. I ended up using a clip for the overflow hose and I also reused the nut that secured the old unit to the tank because the one that came with the package had wings that wouldn't fit underneath where I needed to secure it - saved me a trip to the hardware store. I know this might sound intimidating but the whole process took less than 20 minutes and now my toilet runs like new. If I can do it anyone can!
israelr31
2025-02-17 14:11:13
Fácil de instalar , funciona perfectamente , materiales de buena calidad
Devilish McSpacemonster
2025-01-18 17:06:06
This was a super-easy change. While doing this I also changed the solid copper water lines to the toilets to modern flex hoses. Each toilet took about 10 minutes with minimal difficulties or mess.
Jason
2025-01-13 14:02:15
The repair kit did its job – fixed my toilet without any issues. Very easy to install, and is quite adjustable. Instruction were also pretty clear. Great value.
Customer
2024-12-26 09:34:17
It was easy to install with out tools. And it works perfectly.
Customer
2024-12-01 12:44:15
Took me about 15 min to install the new valve and get it back in service. Use this for the kids bath room. No more water hammer when the toilet is flushed. Kids are happy and I no longer hear a horse coming down the hall. Well worth the purchase. Very happy. Kids are happy as well.
Recommended Products
