---
product_id: 152832628
title: "Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White"
brand: "mkk"
price: "€ 2.57"
currency: EUR
in_stock: false
reviews_count: 13
url: https://www.desertcart.pt/products/152832628-connector-with-backflow-flap-check-valve-connector-ventilation-pipe-round
store_origin: PT
region: Portugal
---

# Durable white PVC plastic 100 mm diameter fit Backflow flap prevents air return Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White

**Brand:** mkk
**Price:** € 2.57
**Availability:** ❌ Out of Stock

## Summary

> 🌀 Keep your air fresh and your space flawless with the ultimate backflow barrier!

## Quick Answers

- **What is this?** Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White by mkk
- **How much does it cost?** € 2.57 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/152832628-connector-with-backflow-flap-check-valve-connector-ventilation-pipe-round)

## Best For

- mkk enthusiasts

## Why This Product

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

## Key Features

- • **Sleek & Durable PVC Build:** Smooth white finish blends with any ventilation setup while resisting wear and tear.
- • **One-Way Airflow Protection:** Backflow flap ensures fresh air stays in, blocking unwanted drafts and odors.
- • **Seamless 100 mm Connection:** Perfectly fits standard 4-inch ventilation pipes for hassle-free installation.
- • **Versatile Indoor/Outdoor Use:** Engineered for apartments, homes, and commercial spaces—wherever clean airflow matters.
- • **Trusted Quality with Warranty:** Backed by a 2-year manufacturer guarantee for peace of mind and lasting performance.

## Overview

This 100 mm diameter PVC connector with an integrated backflow flap is designed for ventilation systems in residential and commercial buildings. It prevents air from flowing backward, ensuring only fresh air circulates. The white, smooth plastic finish offers durability and aesthetic appeal, fitting standard 4-inch ducts seamlessly. Ideal for maintaining clean airflow, it comes with a 2-year manufacturer warranty for reliable, long-term use.

## Description

Ventilation systems are intended for air distribution in ventilation systems of apartments, houses and commercial buildings. Perfect for places where the air should not return and only fresh air should remain. Connection from pipe to pipe. Specifications: Material: PVC plastic; Colour: white; Diameter: 100 mm. Note: The backflow flap may be red, blue or green in contrast to the product image. The connector itself is white

Review: Perfect fit - I've being looking for a coupling that fits perfectly on my dryer vent and I found with this backlog flapper.
Review: Good. - No gaskets or o-rings to help seal, but should stop most back draft. Here is a much better one: AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans https://a.co/d/hodpLQl I used this one in a corner just above the room and the better one at the outside wall. Fits nicely into a 4" 90.

## Features

- Material: PVC plastic
- Colour: white
- Diameter: 100 mm
- Kitchen
- Volume: 0.001 m3

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00FCE0RSE |
| Best Sellers Rank | #661,599 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,767 in HVAC Ducting |
| Brand | MKK |
| Brand Name | MKK |
| Color | White |
| Connector Type | Plug |
| Customer Reviews | 4.3 out of 5 stars 3,512 Reviews |
| Exterior Finish | Smooth plastic surface |
| Included Components | No |
| Item Dimensions | 3.94 x 3.94 x 2.36 inches |
| Item Type Name | Building material |
| Item dimensions L x W x H | 3.94 x 3.94 x 2.36 inches |
| Manufacturer | MKK |
| Manufacturer Part Number | A289a_SML |
| Manufacturer Warranty Description | 2 Year Manufacturer Guarantee. |
| Material | Polyvinyl Chloride |
| Material Type | Polyvinyl Chloride |
| Model Number | KO100-22 |
| Number of Pieces | 1 |
| Size | Klein |
| Thread Size | 4 inch |
| Thread Type | UN |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** MKK
- **Color:** White
- **Connector Type:** Plug
- **Exterior Finish:** Smooth plastic surface
- **Item dimensions L x W x H:** 3.94 x 3.94 x 2.36 inches
- **Material:** Polyvinyl Chloride
- **Number of Pieces:** 1
- **Size:** Klein
- **Thread Size:** 4 inch
- **Thread Type:** UN

## Images

![Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White - Image 1](https://m.media-amazon.com/images/I/410JRbLJ-6L.jpg)
![Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White - Image 2](https://m.media-amazon.com/images/I/61Sf3d3RwsL.jpg)
![Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White - Image 3](https://m.media-amazon.com/images/I/41NTOGieKAL.jpg)
![Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White - Image 4](https://m.media-amazon.com/images/I/41UqnXvbw6L.jpg)
![Connector with Backflow Flap, Check Valve, Connector, Ventilation Pipe, Round Duct, Ventilation System, Pipe Connector, Diameter 100 mm, White - Image 5](https://m.media-amazon.com/images/I/4161WRlGmgL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit
*by A***O on May 3, 2026*

I've being looking for a coupling that fits perfectly on my dryer vent and I found with this backlog flapper.

### ⭐⭐⭐⭐ Good.
*by G***W on August 7, 2024*

No gaskets or o-rings to help seal, but should stop most back draft. Here is a much better one: AC Infinity 4" Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans https://a.co/d/hodpLQl I used this one in a corner just above the room and the better one at the outside wall. Fits nicely into a 4" 90.

### ⭐⭐⭐⭐⭐ Fits 4" fine
*by P***R on November 14, 2025*

Fit a 4" bath vent with no issues

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.pt/products/152832628-connector-with-backflow-flap-check-valve-connector-ventilation-pipe-round](https://www.desertcart.pt/products/152832628-connector-with-backflow-flap-check-valve-connector-ventilation-pipe-round)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-07-07*