---
product_id: 503150456
title: "8\" to 4\" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch)"
brand: "repa market"
price: "₩97035"
currency: KRW
in_stock: true
reviews_count: 13
category: "Repa Market"
url: https://www.desertcart.kr/products/503150456-8-to-4-inch-200-to-100-mm-round-galvanized
store_origin: KR
region: South Korea
---

# Optimized airflow efficiency 8" to 4" size precision Galvanized steel durability 8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch)

**Brand:** repa market
**Price:** ₩97035
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your airflow game with precision and durability!

## Quick Answers

- **What is this?** 8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) by repa market
- **How much does it cost?** ₩97035 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/503150456-8-to-4-inch-200-to-100-mm-round-galvanized)

## Best For

- repa market enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Galvanized steel construction resists corrosion and wear for long-term reliability
- • **Universal Fit:** Male-to-male design ensures a secure, leak-free connection every time
- • **DIY & Pro Ready:** Lightweight yet sturdy, perfect for both home projects and professional installations
- • **Versatile Application:** Ideal for extractor fans, tumble dryers, cooker hoods, and hydroponics setups
- • **Seamless Size Transition:** Effortlessly adapts 8" ducts to 4" for perfect HVAC compatibility

## Overview

This 8" to 4" galvanized steel duct reducer offers a robust, corrosion-resistant solution for downsizing round ducting in HVAC, ventilation, and exhaust systems. Designed with a male-to-male fit, it guarantees secure connections and optimal airflow, making it a must-have for both residential and commercial applications.

## Description

Shop 8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch). Free delivery on eligible orders of £20 or more.

Review: Good sizing - Solved my extractor size issues
Review: Perfect - Well made and has no sharp edges and does what it’s meant to do!

## Features

- Galvanized Steel 199 mm Male to 99 mm Male Round Ducting Adaptor / 8" (7.83") to 4" (3.90")
- Can be used with HVAC systems, bathroom extractor fans, inline ventilators, cooker hoods, tumble dryers, hydroponics, kitchens or, anywhere else in the apartment, home or office space.
- Sturdy Steel ducting is perfect for DIY and Trade use.
- Works as a reducer or increaser; Male to Male fit; Ensures secure fit for ventilation fans, dryer ducts, and exhaust vent pipes while maintaining high airflow efficiency.
- Perfectly suited for ducting your Tumble Dryer, Bathroom or Any type of extractor fan, Hydroponics, In-Line Extract Fans, or Cooker Hood.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09PLLPR73 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 27,510 in DIY & Tools ( See Top 100 in DIY & Tools ) 76 in Ducting |
| Colour | Galvanized |
| Customer Reviews | 4.6 4.6 out of 5 stars (972) |
| Date First Available | 3 Jan. 2022 |
| Finish | Galvanized Steel |
| Included Components | Galvanized Steel Duct Reducer |
| Item Package Quantity | 1 |
| Item Weight | 290 g |
| Manufacturer | Repa Market |
| Material | Metal |
| Number of Pieces | 1 |
| Product Dimensions | 20.3 x 13.6 x 20.3 cm; 290 g |
| Shape | Circular |
| Size | 4 to 8 Inch / 100 to 200 mm |
| Special Features | Easy to Install |
| Style | Reducer/Increaser |
| Usage | Commercial/Residential |

## Product Details

- **Brand:** Repa Market
- **Colour:** Galvanized
- **Connector type:** Coupling, Reducer
- **Exterior finish:** Galvanized
- **Item dimensions L x W x H:** 20.3 x 13.6 x 20.3 centimetres
- **Material:** Metal
- **Number of pieces:** 1
- **Size:** 4 to 8 Inch / 100 to 200 mm
- **Thread size:** 2, 3, 4, 5, ou 6 pouces
- **Thread type:** NPT

## Images

![8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - Image 1](https://m.media-amazon.com/images/I/81qzSV3WW8L.jpg)
![8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - Image 2](https://m.media-amazon.com/images/I/714ey+QwzpL.jpg)
![8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - Image 3](https://m.media-amazon.com/images/I/81w6YSILurL.jpg)
![8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - Image 4](https://m.media-amazon.com/images/I/81TDxKDA4OL.jpg)
![8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch) - Image 5](https://m.media-amazon.com/images/I/81XzMsqRdML.jpg)

## Available Options

This product comes in different **Material Type, Size** options.

## Questions & Answers

**Q: will this work for a bathroom fan duct that I need to decrease from 4" - 3" to fit in an eave vent? some people say that the reducer is the same size**
A: It may work in an eave vent. I used it right off the ceiling vent fan.  The exhaust duct on the old  fan was 3 inch and the fan vent opening on the new fan was 4 inch. Aluminum taped inside and outside, then double wrapped the ducting. As strong as the reducer is, it would be difficult to reduce the length

**Q: What's the temperature rating on this reducer?**
A: Its galvanized steel! Unless you r looking for industrial stuff, the temp rate must be way above what you need; if you looking for industrial, steer clear!

**Q: Can you clamp this to a 4 inch dryer vent? not the hose side**
A: You need a duct splitter probably.. I don't really know what you're trying
to do

**Q: Will this work for a portable electric dryer?**
A: I used it to vent a free-standing a/c unit. I did not have a window and drilled a hole in the wall and used this to vent it. I would think it would work for your dryer.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good sizing
*by A***R on 20 July 2025*

Solved my extractor size issues

### ⭐⭐⭐⭐⭐ Perfect
*by S***L on 23 December 2025*

Well made and has no sharp edges and does what it’s meant to do!

### ⭐⭐⭐⭐⭐ Would recommend but measure before you buy
*by S***. on 15 April 2025*

Perfect fit for my laser extraction unit, reducer fitted a 3” flexi pipe. Measure you inlet connection to your extraction unit as this is just shy of 4”

## Frequently Bought Together

- 8" to 4" Inch / 200 to 100 mm Round Galvanized Steel Duct Reducer - Duct Fitting - Pipe Increaser Reducer - Metal Tube Reducing Coupling for Drain, Waste and Ventilation (8 to 4 Inch)
- RENKE - Pack of 4 Large Adjustable 304 Stainless Steel Hose Clamps (91-114mm) for HVAC, Passive Vents, and Air Conditioning Systems,Hose Clips,Hose clamp,Pipe Clips,Hose Clamps,Large Clamps

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**Shop now:** [https://www.desertcart.kr/products/503150456-8-to-4-inch-200-to-100-mm-round-galvanized](https://www.desertcart.kr/products/503150456-8-to-4-inch-200-to-100-mm-round-galvanized)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-02-27*