---
product_id: 4757091
title: "400LS Leak Sentry Pro Fill Valve , Black"
brand: "fluidmaster"
price: "2224 DH"
currency: MAD
in_stock: true
reviews_count: 13
category: "Fluidmaster"
url: https://www.desertcart.ma/products/4757091-400ls-leak-sentry-pro-fill-valve-black
store_origin: MA
region: Morocco
---

# Prevents water overfill Leak-alert locking action Made in USA quality 400LS Leak Sentry Pro Fill Valve , Black

**Brand:** fluidmaster
**Price:** 2224 DH
**Availability:** ✅ In Stock

## Summary

> 💧 Lock leaks, save water, and upgrade your flush game!

## Quick Answers

- **What is this?** 400LS Leak Sentry Pro Fill Valve , Black by fluidmaster
- **How much does it cost?** 2224 DH with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/products/4757091-400ls-leak-sentry-pro-fill-valve-black)

## Best For

- fluidmaster enthusiasts

## Why This Product

- Trusted fluidmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Operation:** Toilet stays fully functional even during leak alerts—no disruption, no hassle.
- • **Smart Water Efficiency:** Adjustable bowl refill stops wasteful overfilling, cutting unnecessary water use.
- • **Leak-Proof Peace of Mind:** Instant leak alerts save water and money before damage occurs.
- • **Built to Last, Made in USA:** Durable construction ensures long-term reliability for busy multi-housing setups.
- • **Easy Upgrade, Instant Savings:** Quick install with advanced leak-sentry tech—your smartest plumbing investment yet.

## Overview

The Fluidmaster 400LS Leak Sentry Pro Fill Valve is a durable, US-made toilet fill valve featuring a patented locking action that detects leaks early to prevent water waste and costly damage. Ideal for multi-housing applications, it maintains full toilet functionality while alerting users to leaks and includes an adjustable bowl refill to optimize water use. This easy-to-install valve combines proven Fluidmaster reliability with smart water-saving technology, backed by a lifetime warranty.

## Description

Product Description Fluidmaster 400LS Leak Sentry Pro Fill Valve From the Manufacturer "Locking" action alerts users to leaks before money and water are wasted. Ideal for multi-housing applications. Toilet remains fully operational.

Review: Reliable and Easy-to-Install Fill Valve - This fill valve works perfectly and was very easy to install. The leak-sentry feature adds great peace of mind, helping prevent silent leaks and wasted water. It fills quickly and quietly, and the quality feels solid and durable. A great upgrade from the standard valves — highly recommend for anyone doing a toilet repair or replacement.
Review: You want this model- it will save you a lot of $ if you ever have a toilet tank leak (who doesn't??) - Flo master has a bunch of models but this one, at almost the same price as the basic one, has a brilliant feature! It will alert you if your tank is leaking water and, while you address it (if ever) the most you will lose is one tankful between flushes! This is how it works, when the tank empties, it differentites between a flush and a slow leak. if it's a flush it will refill immediately. if it's a slow leak , it won't refill until you attempt to flush the next time (you'll have to push the lever twice -first time it will refill; 2nd time it will flush- you will have to wait typically under 60 seconds, get it? It works with most standard toilets that have a chain and a flapper (I recently tried to install one at a friend's house and it does not work with the advanced one that have tewo buttons on top to choose between a small flush and a large flush)

## Features

- Fluidmaster leak sentry toilet fill valve - 181069
- This is highly durable
- This is manufactured in United states
- Locking action alerts users to leaks before money and water are wasted
- Ideal for multi-housing applications
- Toilet remains fully operational
- Bowl refill adjustment prevents wasteful overfilling
- All the features of the proven 400A Fill Valve (1554-3143)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQUHUQ |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #119,519 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #166 in Toilet Flush Valves |
| Brand | Fluidmaster |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (302) |
| Date First Available | February 17, 2007 |
| Exterior Finish | Plastic |
| Global Trade Identification Number | 00039961004000 |
| Included Components | Rough Plumbing;Parts and Repair;flush-valves |
| Inlet Connection Size | 0.88 Inches |
| Inlet Connection Type | Threaded |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 9.3 ounces |
| Item dimensions L x W x H | 5.75 x 16 x 14.5 inches |
| Item model number | 400LS |
| Manufacturer | Fluidmaster |
| Material | Plastic |
| Number of Ports | 1 |
| Outlet Connection Size | 0.88 Inches |
| Outlet Connection Type | NPT |
| Part Number | 400LS |
| Product Dimensions | 5.75 x 16 x 14.5 inches |
| Size | Pack of 1 |
| Specification Met | CSA, NSF, RoHS, UL |
| UPC | 717029396419 039961415080 039961004000 |
| Warranty Description | Lifetime |

## Product Details

- **Brand:** Fluidmaster
- **Exterior Finish:** Plastic
- **Inlet Connection Size:** 0.88 Inches
- **Inlet Connection Type:** Threaded
- **Item dimensions L x W x H:** 5.75 x 16 x 14.5 inches
- **Material:** Plastic
- **Number of Ports:** 1
- **Outlet Connection Size:** 0.88 Inches
- **Outlet Connection Type:** NPT
- **Specification Met:** CSA, NSF, RoHS, UL

## Images

![400LS Leak Sentry Pro Fill Valve , Black - Image 1](https://m.media-amazon.com/images/I/51DHKeTiXfL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: noisy toilet ?cause**
A: I didn't consider this unit to be noisy - actually quieter than the model that replaced it and didn't cause water hammer at shut off like the new one. The problem with that one is the problematic Leak Sentry system and that's the reason I got rid of it.

**Q: It says American made and orgin of China. Which is it?**
A: There is no origin on any component or the instructions but the bottom of the box says "assembled in Mexico".

**Q: To make this short, one of my Fluidmasters decided not to work one day.  Refill would not shut off; had to keep the tank lid off and move the float va**
A: Check for some dirt or other foreign material in the valve and float.  Also make sure that the float height adjustment is set correctly so that it shuts off below the top of the bowl fill tube.  Otherwise the water cannot get high enough for the float to turn off the valve.

**Q: Does this work on most toilets, even if their original system was not this brand?**
A: Yes it does, it is a universal fill valve that will replace many of the older types of toilet valves

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable and Easy-to-Install Fill Valve
*by H***Y on October 17, 2025*

This fill valve works perfectly and was very easy to install. The leak-sentry feature adds great peace of mind, helping prevent silent leaks and wasted water. It fills quickly and quietly, and the quality feels solid and durable. A great upgrade from the standard valves — highly recommend for anyone doing a toilet repair or replacement.

### ⭐⭐⭐⭐⭐ You want this model- it will save you a lot of $ if you ever have a toilet tank leak (who doesn't??)
*by H***I on October 2, 2023*

Flo master has a bunch of models but this one, at almost the same price as the basic one, has a brilliant feature! It will alert you if your tank is leaking water and, while you address it (if ever) the most you will lose is one tankful between flushes! This is how it works, when the tank empties, it differentites between a flush and a slow leak. if it's a flush it will refill immediately. if it's a slow leak , it won't refill until you attempt to flush the next time (you'll have to push the lever twice -first time it will refill; 2nd time it will flush- you will have to wait typically under 60 seconds, get it? It works with most standard toilets that have a chain and a flapper (I recently tried to install one at a friend's house and it does not work with the advanced one that have tewo buttons on top to choose between a small flush and a large flush)

### ⭐⭐⭐⭐⭐ No water waste.
*by B***T on December 6, 2025*

Best water valve I’ve seen. Will not refill your tank automatically if your flapper leaks. The handle must be pushed to activate filling.

## Frequently Bought Together

- Fluidmaster 400LS Leak Sentry Pro Fill Valve , Black
- Fluidmaster 502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 pack
- Fluidmaster 5403 3-Inch Water Saving Long Life Toilet Flapper

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*Product available on Desertcart Morocco*
*Store origin: MA*
*Last updated: 2026-03-03*