---
product_id: 13493487
title: "FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention"
brand: "floodstop"
price: "$400.51"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/13493487-floodstop-water-heater-auto-shutoff-valve-fs3-4npt-v4-controller
store_origin: US
region: United States of America
---

# Auto-shutoff feature Easy installation Water damage prevention FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention

**Brand:** floodstop
**Price:** $400.51
**Availability:** ✅ In Stock

## Summary

> 🚰 Stop leaks before they start!

## Quick Answers

- **What is this?** FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention by floodstop
- **How much does it cost?** $400.51 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/13493487-floodstop-water-heater-auto-shutoff-valve-fs3-4npt-v4-controller)

## Best For

- floodstop enthusiasts

## Why This Product

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

## Key Features

- • **Compact Size:** Fits in tight spaces with dimensions of 12 x 8 x 3 inches.
- • **Smart Control:** V4 controller for seamless operation.
- • **Durable Material:** Constructed from high-quality wood for longevity.
- • **Lightweight Design:** Weighs only 1.92 pounds for easy handling.
- • **Protect Your Space:** Automatically shuts off water flow to prevent damage.

## Overview

The FloodStop Water Heater Auto-Shutoff Valve (FS3/4NPT, V4 Controller) is a cutting-edge solution designed to prevent water damage in your home. Weighing just 1.92 pounds and measuring 12 x 8 x 3 inches, this valve is easy to install and operates automatically to shut off water flow, ensuring peace of mind and protection for your property.

## Description

FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention

## Features

- Auto-Shutoff Valve

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Onsite Pro |
| Part Number | FS3/4NPT v4 |
| Item Weight | 1.92 pounds |
| Product Dimensions | 12 x 8 x 3 inches |
| Item model number | FS3/4NPT v4 |
| Is Discontinued By Manufacturer | No |
| Size | One Size |
| Style | Valve |
| Material | Wood |
| Thickness | 1 Miles |
| Item Package Quantity | 1 |
| Measurement System | US |
| Included Components | FS3/4NPT |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention - Image 1](https://m.media-amazon.com/images/I/91xbnRzOAaL.jpg)
![FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention - Image 2](https://m.media-amazon.com/images/I/91cKJ4+bA1L.jpg)
![FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention - Image 3](https://m.media-amazon.com/images/I/911b7AzDqdL.jpg)

## Available Options

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

## Questions & Answers

**Q: Replaced the batteries twice with new Duracell’s. The unit is back online, and the valves work, no moisture, but we still get a beep every 60 sec?**
A: Defective Unit. Have two units for a year.  So Far, So Good.  Cycling each  month is a good idea.  Batteries are a Backup system for power outage.

**Q: Is there an indication (light etc.) if the unit is running only on batteries but not on AC power?**
A: no.  only low battery notification

**Q: If there is problem with the unit can it be opened manualy?**
A: Yes, there are instructions in the manual included.  I elected to install a parallel shut off valve beside the flood stop valve. I purchased two tees and a valve. I had some pex pipes and crimp clamps on hand, so minimal expense.  Valve is normally closed. If the flood stop would close and you want water, open your bypass valve.  Be careful, you may have a leak.

**Q: Do I really need this if my tank is by a couple of floor drains?**
A: Why wouldn't you even with the drains? Your tank leaks, the valve closes, the water stops and you buy a new heater. It's like an insurance policy. Hopefully you don't use it but it's good to know it's there if you do..

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**Shop now:** [https://www.desertcart.us/products/13493487-floodstop-water-heater-auto-shutoff-valve-fs3-4npt-v4-controller](https://www.desertcart.us/products/13493487-floodstop-water-heater-auto-shutoff-valve-fs3-4npt-v4-controller)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-18*