---
product_id: 296767091
title: "Internal Backwater Valve,2-F 2\" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection"
brand: "minimprover"
price: "HK$376"
currency: HKD
in_stock: true
reviews_count: 13
category: "Minimprover"
url: https://www.desertcart.hk/products/296767091-internal-backwater-valve-2-f-2-float-model-flood-guard
store_origin: HK
region: Hong Kong
---

# 4-inch float valve seal Easy screwdriver install Solid brass durability Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection

**Brand:** minimprover
**Price:** HK$376
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection by minimprover
- **How much does it cost?** HK$376 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/296767091-internal-backwater-valve-2-f-2-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 ensuring a perfect, leak-proof seal every time.
- • **Unmatched Durability:** Crafted from solid brass and molded rubber for corrosion resistance and long-lasting flood defense.
- • **Trusted by Homeowners:** Proven performance with a 4.1-star rating and rave reviews for reliable basement flood prevention.
- • **Effortless Installation:** Install in minutes with just a screwdriver—no professional help needed, saving time and money.
- • **Smart Backflow Protection:** Float-activated valve automatically seals off sewer backflow, preventing costly water damage and messy cleanups.

## Overview

The Minimprover 4" Float Model Flood-Guard is a robust internal backwater valve made from solid brass and molded rubber, designed to fit standard 4-inch flood drains. It features a float-activated check valve that automatically seals off sewer backflow, protecting your property from flood damage. Easy to install with just a screwdriver, this valve offers durable, corrosion-resistant flood protection trusted by homeowners to prevent costly basement backups 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: Perfect fit - Works great, both blocking water backup and smell.
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】: 2-F 2" Float Model Flood-Guard for 2-inch Flood Drains
- 【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.
- 【Advantage】: 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 2" Float Model Flood-Guard.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Minimprover |
| Exterior Finish | Brass |
| Inlet Connection Size | 2 inches |
| Inlet Connection Type | Threaded |
| Material | Brass |
| Material Type | Brass |
| Outlet Connection Size | 2 inches |
| Outlet Connection Type | Threaded |
| Size | 2" Flood-Guard |
| Specification Met | ANSI B16.11, ASME B16.34 |

## Product Details

- **Brand:** Minimprover
- **Exterior Finish:** Brass
- **Inlet Connection Size:** 4 Inches
- **Inlet Connection Type:** Standard Pipe Thread
- **Manufacturer:** Minimprover
- **Material:** Brass, Rubber
- **Number of Ports:** 2
- **Outlet Connection Size:** 4 Inches
- **Outlet Connection Type:** NPT
- **UPC:** 779880498541

## Images

![Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 1](https://m.media-amazon.com/images/I/61K7xcpQL4L.jpg)
![Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 2](https://m.media-amazon.com/images/I/61r1fEm3BgL.jpg)
![Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 3](https://m.media-amazon.com/images/I/61jUiFx0ewL.jpg)
![Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 4](https://m.media-amazon.com/images/I/61cukUHG+fL.jpg)
![Internal Backwater Valve,2-F 2" Float Model Flood-Guard for 2-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection - Image 5](https://m.media-amazon.com/images/I/615B4i4yFOL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit
*by K***M on July 29, 2026*

Works great, both blocking water backup and smell.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐ Does the job!
*by J***K on March 23, 2026*

Great product! Best advice. Inspect periodically as the spring may break. And to make it much easier to remove, make sure the drain wall is as clean and smooth as possible and lube up the rubber seal with anti-seizing lubricant.

## Frequently Bought Together

- Minimprover Internal Backwater Valve,4-F 4" Float Model Flood-Guard for 4-inch Flood Drains,Drain Backflow Preventer for Sewer Flood Protection
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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-08-14*