Fluidmaster 400H Universal Toilet Fill Valve – Fixes Running, Noisy & Slow-Filling Toilets, No Plumber Needed
Fluidmaster 400H Universal Toilet Fill Valve – Fixes Running, Noisy & Slow-Filling Toilets, No Plumber Needed
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Fluidmaster 400H Universal Toilet Fill Valve – Fixes Running, Noisy & Slow-Filling Toilets, No Plumber Needed
Stop a Running Toilet in About 15 Minutes
✓Fits most US toilets: adjusts from 9" to 13"
✓Installs in about 15 minutes, no plumber
✓Fills fast, shuts off on its own, runs quiet
✓2 valves per pack: fix two bathrooms, or keep a spare
That constant hiss. The handle you jiggle every night. The water bill that keeps creeping up. When your toilet won't stop running, a worn-out fill valve is often the culprit, and replacing it is one of the easiest repairs in your home.
🔊 That Sound Is Money Going Down the Drain
A running toilet doesn't just keep you up at night. According to the EPA, it can waste about 200 gallons of water a day. Every day. While you sleep, while you're at work, while you're planning to get to it this weekend.
Jiggling the handle buys you a few quiet minutes. It doesn't fix anything.
🔍 The 10-second check
Lift the tank lid and find the open pipe in the middle. That's the overflow tube.
Water keeps spilling into the tube? Your fill valve isn't shutting off. This is your fix.
Water level slowly drops, then the tank refills on its own? That's usually a leaking flapper, not the fill valve.
✅ The Part That Actually Fixes It
This universal fill valve replaces the worn-out one in your tank and gets your toilet back to doing its job: refill fast after every flush, shut off on its own, and stay quiet.
Every pack comes with two valves. Fix both bathrooms in one afternoon, or keep the spare in a drawer. Fill valves typically last around 5 years, and less in homes with hard water, so your next repair takes 15 minutes instead of a trip to the hardware store.
📏 Will It Fit My Toilet?
The valve adjusts from 9" to 13", so it fits most standard US toilet tanks.
The easiest way to get it right: set the new valve to the same height as your old one. That's it. The standard US connection hooks up to the supply line you already have.
Works with most standard gravity-flush toilets. Not designed for pressure-assist toilets or tanks with a built-in, brand-specific fill system.
🌙 Fills Fast. Shuts Off. Goes Quiet.
After every flush, the valve refills the tank quickly, then closes on its own as soon as the water reaches your set level. No water sneaking into the overflow tube. No trickling all night. No more 2 AM wake-up calls.
Just a toilet that does its job and then goes quiet.
🎚️ You Decide How Much Water Each Flush Uses
Turn the knob on top of the valve to raise or lower the water level.
- Turn it up for a stronger, cleaner flush.
- Turn it down to use less water with every flush.
For most toilets, the sweet spot is about 1 inch below the top of the overflow tube, or right at the fill line marked inside the tank. Set it once, and the valve stops at that level every time.
🔧 Skip the $125 Plumber Visit
Having a plumber replace a fill valve typically costs around $125*, plus the hassle of booking a time and waiting for them to show up. Doing it yourself takes three steps:
Shut off & remove. Turn off the water, flush to empty the tank and sponge out what's left. Then disconnect the supply line and unscrew the old valve.
Match & install. Set the new valve to the same height as the old one, place it in the tank and tighten the mounting nut underneath until snug. Don't overtighten.
Turn on & adjust. Reconnect the supply line, turn the water back on and dial in your water level. That's it.
What you'll need: a towel, a sponge and an adjustable wrench or pliers. That's the whole toolbox.
*Average fill valve replacement cost, HomeServe cost guide.
🏠 Made for Anyone Tired of a Running Toilet
- ✓Homeowners who are done jiggling the handle and paying for water they never used.
- ✓Homes with two bathrooms. One pack covers both.
- ✓Landlords and property managers who'd rather fix it in 15 minutes than schedule a service call.
- ✓Airbnb and vacation rental hosts who need a fast fix between guests.
- ✓First-time DIYers. If you can turn a wrench, you can do this.
📋 Product Specs
| Brand | Mesalode |
| In the box | 2 universal toilet fill valves |
| Height | Adjusts from 9" to 13" |
| Connection | Standard US toilet supply connection |
| Water level | Adjustable with the top knob |
| Fits | Most standard US gravity-flush toilets |
| Not for | Pressure-assist toilets or built-in proprietary fill systems |
❓ Frequently Asked Questions
Will this fit my toilet?
If your current fill valve stands between 9" and 13" tall, it should fit. The simplest way to get it right is to set the new valve to the same height as your old one. It isn't made for pressure-assist toilets. Still not sure? Email a photo of the inside of your tank to support@mesalode.com, and we'll confirm the fit before you order.
My toilet keeps running. Is it the fill valve or the flapper?
Lift the tank lid. If water is spilling into the overflow tube, the fill valve isn't shutting off, and this valve fixes that. If the water level slowly drops and the tank refills on its own, the flapper is usually leaking and needs replacing instead.
Do I need a plumber or special tools?
No. A towel, a sponge and an adjustable wrench or pliers are all you need, and the swap usually takes about 15 minutes.
Is it noisy?
It refills quickly and runs quietly, then shuts off on its own once the water reaches your set level. No constant hissing, no trickling.
How do I set the water level?
Turn the knob on top of the valve. For most toilets, aim for about 1 inch below the top of the overflow tube, or the fill line marked inside the tank.
Why are there two valves in the pack?
So you can fix two bathrooms at once, or keep a spare for later. Fill valves typically wear out within about 5 years, sooner in homes with hard water.
What if it doesn't fit my toilet?
Send it back within 30 days of receipt, free of charge. Just email support@mesalode.com with your order number for a return label. Original shipping charges aren't refunded. Full details in our return policy.
Tonight could be your first quiet night in weeks.
Grab your 2-pack and get your quiet back.
Not the right fit? Send it back free within 30 days.
