---
product_id: 10134863
title: "Fernco 1056-43 Coupling Flex 4X3 No Metal"
brand: "fernco"
price: "4936 kr"
currency: ISK
in_stock: true
url: https://www.desertcart.is/products/10134863-fernco-1056-43-coupling-flex-4x3-no-metal
store_origin: IS
region: Iceland
---

# 4x3 inch flexible pipe coupling Lightweight at 0.89 lbs for easy handling No metal design for corrosion resistance Fernco 1056-43 Coupling Flex 4X3 No Metal

**Brand:** fernco
**Price:** 4936 kr
**Availability:** ✅ In Stock

## Summary

> 🔧 Connect with confidence — the flexible coupling that keeps your flow flawless!

## Quick Answers

- **What is this?** Fernco 1056-43 Coupling Flex 4X3 No Metal by fernco
- **How much does it cost?** 4936 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/10134863-fernco-1056-43-coupling-flex-4x3-no-metal)

## Best For

- fernco enthusiasts

## Why This Product

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

## Key Features

- • **Versatile & Reliable:** Ideal for plumbing pros and DIYers seeking dependable flexibility
- • **Trusted Industry Leader:** Manufactured by Fernco, a global pioneer since 1964
- • **Seamless Pipe Connection:** Effortlessly links 4-inch to 3-inch pipes with precision fit
- • **Corrosion-Free Durability:** Metal-free design ensures long-lasting, rust-proof performance
- • **Lightweight & Easy Install:** Under 1 lb for quick, hassle-free setup without heavy lifting

## Overview

The Fernco 1056-43 Coupling Flex 4X3 No Metal is a lightweight, corrosion-resistant flexible pipe adapter designed to connect 4-inch to 3-inch pipes seamlessly. Manufactured by Fernco, a trusted industry leader since 1964, this no-metal coupling offers durability and ease of installation, making it a go-to solution for professional plumbers and savvy DIYers alike.

## Description

Product Description               Fernco 1056-43 Coupling Flex 4X3 No Metal                  From the Manufacturer               Established in 1964, Fernco is a global leader in manufacturing high-quality flexible pipe couplings, drainage, and plumbing systems. Renowned for exceptional performance and reliability, Fernco products are trusted by homeowners and professionals alike. With a commitment to innovation and dependability, Fernco has earned a strong reputation for delivering superior solutions. As a proud USA manufacturer, Fernco is dedicated to maintaining the highest standards of production and engineering.

## Features

- Brand: Fernco
- Part Number: 1056-43
- Coupling Flex 4X3 No Metal
- Stock coupling
- Use to connect any two pipes
- Stock coupling
- Use to connect any two pipes
- 4.46-Inch x 3.52-Inch x 4.03-Inch

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Size | 4 x 3 Inch |
| Material | Polyvinyl Chloride, Stainless Steel |
| Brand | Fernco |
| Color | Black |
| Item dimensions L x W x H | 9.27 x 9.27 x 5.99 inches |
| Connector Type | Reducer |
| Thread Size | 4 inch |
| Exterior Finish | Black |
| Thread Type | NPT |
| Item Weight | 0.89 Pounds |
| Number of Pieces | 1 |
| Global Trade Identification Number | 00018578000117 |
| Manufacturer | Fernco Inc. |
| UPC | 018578000117 |
| Part Number | 1056-43 |
| Item Weight | 14.2 ounces |
| Product Dimensions | 9.27 x 9.27 x 5.99 inches |
| Item model number | 1056-43 |
| Is Discontinued By Manufacturer | No |
| Voltage | 120 Volts |
| Item Package Quantity | 1 |
| Measurement System | inch |
| Certification | Use to connect any two pipes |
| Included Components | Fernco 1056-43 Coupling Flex 4X3 No Metal |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Size:** 4 x 3 Inch
- **Material:** Polyvinyl Chloride, Stainless Steel
- **Brand:** Fernco
- **Color:** Black
- **Item dimensions L x W x H:** 9.27 x 9.27 x 5.99 inches
- **Connector Type:** Reducer
- **Thread Size:** 4 inch
- **Exterior Finish:** Black
- **Thread Type:** NPT
- **Item Weight:** 0.89 Pounds

## Images

![Fernco 1056-43 Coupling Flex 4X3 No Metal - Image 1](https://m.media-amazon.com/images/I/51IMEdr8iPL.jpg)
![Fernco 1056-43 Coupling Flex 4X3 No Metal - Image 2](https://m.media-amazon.com/images/I/511Qidt5UAL.jpg)
![Fernco 1056-43 Coupling Flex 4X3 No Metal - Image 3](https://m.media-amazon.com/images/I/5117AMzFOAL.jpg)
![Fernco 1056-43 Coupling Flex 4X3 No Metal - Image 4](https://m.media-amazon.com/images/I/71HrQGnXorL.jpg)
![Fernco 1056-43 Coupling Flex 4X3 No Metal - Image 5](https://m.media-amazon.com/images/I/71qmfHp69ZL.jpg)

## Available Options

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

## Questions & Answers

**Q: I have 3.25" pvc installed for a radon system.  Will this sleeve work or do I need to get a 4" x 4"?**
A: 3.52-Inch is the smaller side of this Fernco.  So it will fit your pipe.  However the other side of this Fernco is 4 ", and would work if your fitting it to a 4 inch pipe or other fixture.  I bought these Fernco 4x3 to join my Radon pipe to my radon inline fan. The fan was 4" on the inlet and the exhaust side.  Two Fernco couplings to complete one job.

**Q: Can someone please tell me what the outside dimensions on both sides are? I'm needing it for a different kind of project than pipe fitting.**
A: My coupling is already installed on the radon fan device, but I tried to take the O.D. measurements of the coupling for you; the 3" side measures 4.05" OD. The 4" side was more difficult to measure exactly with my calipers, but I measured it as 5" OD. I hope this helps you, but if your use requires dead accurate measurements, I would contact the manufacturer directly.

**Q: How flexible is the material? I have a 3.5 x 5.00 and am woondering if it will be flexible enough to stretch over the 5" end.**
A: I went into my garage and looked at one waiting for a project.  The large end measured 4 and a quarter inches inside diameter.  I loosened the band clamp on that end a lot and tried to stretch it.  It did flex some for me.  I think you may possibly be able to stretch it to 5 but not more.  The wall thickness of the rubber is about 3/8 inch so it won't stretch easily.  Using some Vaseline or other lube might help it go on.  I have not tried it on a 5 inch O.D. pipe.

**Q: will this fit over 4 inch pvc pipe**
A: It should fit the 4" PVC pipe, as that is what it is made for. I used it to connect to a 4" O.D. radon fan outlet to a 3" O.D. PVC pipe and it fit both fine. As another user commented, you can use Vaseline or a silicon lubricant on it if the fit is a little tight. Mine went on very easily with no lubricant and had to be tightened with the clamp.

## Frequently Bought Together

- Fernco 1056-43 Coupling Flex 4X3 No Metal
- RadonAway 23029-1 RP140 Radon Mitigation Fan, 4",White
- XYF Air Easy Read Manometer | U-Tube Air Pressure Indicator (Blue)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-01-23*