---
product_id: 51173858
title: "Connector Ventilation Pipe Round Duct Pipe Diameter 125 mm Ventilation System Duct K0125 21"
brand: "mkk"
price: "£18.41"
currency: GBP
in_stock: true
reviews_count: 4
url: https://www.desertcart.co.uk/products/51173858-connector-ventilation-pipe-round-duct-pipe-diameter-125-mm-ventilation
store_origin: GB
region: United Kingdom
---

# 125mm precision fit Seamless duct connection Durable stainless steel Connector Ventilation Pipe Round Duct Pipe Diameter 125 mm Ventilation System Duct K0125 21

**Brand:** mkk
**Price:** £18.41
**Availability:** ✅ In Stock

## Summary

> 🔗 Connect with confidence — seamless airflow starts here!

## Quick Answers

- **What is this?** Connector Ventilation Pipe Round Duct Pipe Diameter 125 mm Ventilation System Duct K0125 21 by mkk
- **How much does it cost?** £18.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/51173858-connector-ventilation-pipe-round-duct-pipe-diameter-125-mm-ventilation)

## 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

- • **Perfect 125mm Fit:** Engineered for flawless connection with standard 5'' round ducts
- • **Lightweight Design:** Only 50g for easy handling and installation
- • **Universal Compatibility:** Fits all Ø125mm round ducting systems for versatile use
- • **Robust Stainless Steel Build:** Ensures long-lasting durability and corrosion resistance
- • **Streamlined Airflow Connector:** Maintains optimal ventilation efficiency with minimal leakage

## Overview

The MKK KO125-21 Connector Ventilation Pipe is a precision-engineered stainless steel fitting designed to seamlessly join two 125mm (5'') round duct pipes. Lightweight yet durable, it ensures efficient airflow and reliable performance in any ventilation system.

## Description

Full description not available

## Features

- Ducting Pipe Connector
- Ducting Size - 125mm/5"
- Connector fits into Ø125mm (5'') round pipe ducting to connect two lengths together in a straight line.
- For use with the Ø125mm (5'') Round Pipe Ducting systems.
- Connector type: Round male fittings - outer Ø125mm (5'') to fit inner Ø125mm (5'') of ducting pipe.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | MKK |
| Model Number | KO125-21 |
| Colour | White |
| Product Dimensions | 1 x 1 x 1 cm; 50 g |
| Material | Stainless Steel |
| Item Weight | 50 g |

## Product Details

- **Size:** 12.5
- **Material:** Stainless Steel
- **Brand:** MKK
- **Colour:** White
- **Item dimensions L x W x H:** 10 x 10 x 10 millimetres
- **Connector type:** Flange
- **Thread size:** 5 inch
- **Exterior finish:** Edelstahl
- **Thread type:** Metric Parallel
- **Number of pieces:** 1

## Images

![Connector Ventilation Pipe Round Duct Pipe Diameter 125 mm Ventilation System Duct K0125 21 - Image 1](https://m.media-amazon.com/images/I/31VjKER-XML.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product.
*by D***N on 27 December 2019*

This is perfect but I ordered the wrong size - My error!!

### ⭐⭐⭐⭐ Its a one-way valve !
*by W***2 on 7 August 2019*

Be aware this coupling has a non-return flap in it which, at time of reviewing, is not stated in the description. However, it is easy to remove. It just explains why it's more expensive than a plain coupling, which you can get elsewhere much cheaper. I was just in a hurry, and it did arrive quickly. It does function as a joint piece with the flap removed.

### ⭐ This does not fit a 5" hose for air conditioning as advertised.
*by D***H on 11 August 2020*

Actually being sold with a hose that it does not fit.This is advertised by amazon as 'frequently bought together'.I guess the part the forgot to mention is 'frequently returned together' and 'buy this if you want to waste your time'.

## Frequently Bought Together

- Connector Ventilation Pipe Round Duct Pipe Diameter 125 mm Ventilation System Duct K0125 21
- NEBURORA 59-82mm Hose Clip Adjustable 304 Stainless Steel Duct Clamps 4 Pack Worm Drive Hose Clamp Clips 3 inch Diameter Fuel Line Hose Pipe Clamps for Dryer Vent Air Duct Automotive Plumb
- Ducting Pipe Elbow 90 Degree 125mm / 5" Round Tube Bend Ventilation Hose Connector Adapter Coupler KO125-23

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**Shop now:** [https://www.desertcart.co.uk/products/51173858-connector-ventilation-pipe-round-duct-pipe-diameter-125-mm-ventilation](https://www.desertcart.co.uk/products/51173858-connector-ventilation-pipe-round-duct-pipe-diameter-125-mm-ventilation)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-19*