---
product_id: 296767091
title: "Internal Backwater Valve,4-F 4\" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection"
brand: "minimprover"
price: "758 kr"
currency: NOK
in_stock: true
reviews_count: 13
category: "Minimprover"
url: https://www.desertcart.no/products/296767091-internal-backwater-valve-4-f-4-float-model-flood-guard
store_origin: NO
region: Norway
---

# 4-inch float valve seal Quick screwdriver install Solid brass durability Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection

**Brand:** minimprover
**Price:** 758 kr
**Availability:** ✅ In Stock

## Summary

> 🚫💦 Stop floods before they start — your 4-inch flood defense hero!

## Quick Answers

- **What is this?** Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection by minimprover
- **How much does it cost?** 758 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/296767091-internal-backwater-valve-4-f-4-float-model-flood-guard)

## Best For

- minimprover enthusiasts

## Why This Product

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

## Key Features

- • **Precision 4-Inch Fit:** Designed specifically for standard 4-inch flood drains to guarantee a perfect seal every time.
- • **Reliable Rubber Gasket:** Soft yet durable molded rubber gasket creates a slip-free, watertight barrier.
- • **Effortless Installation:** Get flood protection in minutes using just a screwdriver—no plumber needed.
- • **Smart Float-Activated Seal:** Automatically blocks sewer backflow when water rises, protecting your property from costly damage.
- • **Built to Last with Solid Brass:** Corrosion-resistant brass ensures decades of flood defense without rust or wear.

## Overview

The Minimprover 4" Float Model Flood-Guard is a premium internal backwater valve crafted from solid brass and molded rubber. Engineered for 4-inch flood drains, it uses a float-activated check valve mechanism to prevent sewer backflow and flooding. Easy to install with just a screwdriver, this durable valve offers reliable, corrosion-resistant protection that safeguards your property from water damage and messy cleanups.

## Description

★ Great Material: The main parts are made of solid brass which is durable and corrosion resistant.The gaskets are made of molded rubber which is soft and durable. ★ Adventage: ***1.Very easliy to install just need a screwdriver. ***2.Help reduce losses, and some messy cleanup work. ***3.The embeded gasket provides strong seal without slipping. ***4.Solid brass construction for unsurpassed durability. ★ Package includes: 1Pack 2" Float Model Flood-Guard.

Review: Well made. - Well made, works great. Because the old floor drain had rusted during the last 80 years the opening was larger than 2 inches. I used a 2 part epoxy putty to fill the gaps…after cleaning everything very well. If you are putting this in an old steel or cast iron floor drain, getting it to fit may take a little creativity, but this is a well made back flow preventer that will work in 2 inch or slightly larger floor drains.
Review: Great to have a check valve - After reading a few other reviews I decided to check the material type. Screws and spring are all nonmagnetic indicating they are stainless steel. Brass plates are also nonmagnetic, everything looks good. I loosened up the screws until they were just attached then pressed in the rubber sleeve until it was free from friction contact to the brass plates. I then was able to push the unit into the 4" pipe by hand. Then tightened the screws a little bit going across like you tighten lug nuts on a wheel. This is the second check valve like this I used. The first one worked good for 15 years, just decided it was time. My neighbors had backwash problems but I didn't. After removing the original valve I saw turds at the surface of the water... Flushed them down with a hose and was very happy I had a check valve in place.

## Features

- ★ 【Material】: The main parts are made of solid brass which is durable and corrosion resistant.The gaskets are made of molded rubber which is soft and durable.
- ★ 【SIZE】: 4-F 4" Float Model Flood-Guard for 4-inch Flood Drains! Please check the size of drain tube before buying!
- ★ 【Introduction】: Flood-Guard operates like a check valve to seal off water back-up caused by overloaded sewers. Water flows normally through the drain until the sewer begins to back up. Then the Flood-Guard float rises to seal off the drain opening until the water recedes.
- ★ 【Adventage】: A screwdriver and a couple of minutes are all you need to install a Flood-Guard. Once in place, it can prevent property damage and a very messy clean-up job.
- ★ 【Package Include】: 1Pack 4" Float-guard Model Flood-Guard.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08QHZ1YFQ |
| Best Sellers Rank | #122,929 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #558 in Flood Lights |
| Brand | Minimprover |
| Brand Name | Minimprover |
| Connector Type | Threaded |
| Customer Reviews | 4.1 out of 5 stars 391 Reviews |
| Exterior Finish | Brass |
| Inlet Connection Size | 4 inches |
| Inlet Connection Type | Standard Pipe Thread |
| Manufacturer | Minimprover |
| Manufacturer Part Number | H087-4 |
| Material | Brass , Rubber |
| Material Type | Brass, Rubber |
| Model Number | H087-4 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Number of Ports | 2 |
| Outlet Connection Size | 4 inches |
| Outlet Connection Type | NPT |
| Size | 4" Flood-Guard |
| Thread Size | 4 inches |
| Thread Type | Standard Pipe Thread |
| UPC | 779880498541 |
| Unit Count | 1 Count |
| Valve Type | Check Valve |

## Product Details

- **Brand:** Minimprover
- **Exterior Finish:** Brass
- **Inlet Connection Size:** 4 inches
- **Inlet Connection Type:** Standard Pipe Thread
- **Material:** Brass, Rubber
- **Number of Packs:** 1
- **Number of Ports:** 2
- **Outlet Connection Size:** 4 inches
- **Outlet Connection Type:** NPT
- **Unit Count:** 1 Count

## Images

![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 1](https://m.media-amazon.com/images/I/61l9DzIp9kL.jpg)
![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 2](https://m.media-amazon.com/images/I/611i8Sj4kpL.jpg)
![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 3](https://m.media-amazon.com/images/I/71Hl7IzsSNL.jpg)
![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 4](https://m.media-amazon.com/images/I/61petjfN8-L.jpg)
![Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 5](https://m.media-amazon.com/images/I/618UMumnJKL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well made.
*by K***R on September 1, 2026*

Well made, works great. Because the old floor drain had rusted during the last 80 years the opening was larger than 2 inches. I used a 2 part epoxy putty to fill the gaps…after cleaning everything very well. If you are putting this in an old steel or cast iron floor drain, getting it to fit may take a little creativity, but this is a well made back flow preventer that will work in 2 inch or slightly larger floor drains.

### ⭐⭐⭐⭐⭐ Great to have a check valve
*by I***U on March 4, 2026*

After reading a few other reviews I decided to check the material type. Screws and spring are all nonmagnetic indicating they are stainless steel. Brass plates are also nonmagnetic, everything looks good. I loosened up the screws until they were just attached then pressed in the rubber sleeve until it was free from friction contact to the brass plates. I then was able to push the unit into the 4" pipe by hand. Then tightened the screws a little bit going across like you tighten lug nuts on a wheel. This is the second check valve like this I used. The first one worked good for 15 years, just decided it was time. My neighbors had backwash problems but I didn't. After removing the original valve I saw turds at the surface of the water... Flushed them down with a hose and was very happy I had a check valve in place.

### ⭐⭐⭐⭐ WORKS OK
*by B***. on January 19, 2025*

I PURCHASED THESE FOR MY BASEMENT FLOOR DRAINS. BOTH DRAINS HAVE CONDENSATION LINES THAT DISCHARGE INTO THEM. THE FAULT I FOUND WAS THE SPRING WAS TOO TIGHT AND THE RUBBER STOPPER WOULD NOT ALLOW ANY WATER TO GO "DOWN". I HAD TO CUT A FEW COILS OFF THE SPRING TO ALLOW THE RUBBER STOPPER TO "HANG" SLIGHTLY DOWN. NOW THE CONDENSATION WILL GO DOWN. WE FINALLY HAD A BIG ENOUGH RAIN WITH LAST YEAR'S HURRICANE AND THEY WER PUT TO THE TEST. IT WASN'T A TOTAL SUCCESS, BUT DEFFENITELY BETTER THAN NO BACKFLOW DEVICE. A SMALL AMOUNT OF WATER SEEPED UP THROUGH THE FLOOR DRAINS, BUT DEFINATELY KEPT THE BASEMENT FROM FLOODING COMPLETELY. PROBABLY WOULD HAVE BEEN 100% IF I DIDN'T HAVE TO MAKE A MODIFICATION TO THEM.

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*Product available on Desertcart Norway*
*Store origin: NO*
*Last updated: 2026-09-16*