---
product_id: 68406084
title: "Fernco P1056-43 4 3-Inch Stock Coupling 1056-43 Flex 4X3 No Metal, 120 V, Black, 4 x 3 Inch"
brand: "fernco"
price: "₨38615"
currency: LKR
in_stock: false
reviews_count: 5
url: https://www.desertcart.lk/products/68406084-fernco-p1056-43-4-3-inch-stock-coupling-1056-43
store_origin: LK
region: Sri Lanka
---

# Lightweight 0.89 lbs for easy handling 4x3 inch flexible coupling No metal, corrosion-proof design Fernco P1056-43 4 3-Inch Stock Coupling 1056-43 Flex 4X3 No Metal, 120 V, Black, 4 x 3 Inch

**Brand:** fernco
**Price:** ₨38615
**Availability:** ❌ Out of Stock

## Summary

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

## Quick Answers

- **What is this?** Fernco P1056-43 4 3-Inch Stock Coupling 1056-43 Flex 4X3 No Metal, 120 V, Black, 4 x 3 Inch by fernco
- **How much does it cost?** ₨38615 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/68406084-fernco-p1056-43-4-3-inch-stock-coupling-1056-43)

## 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 Fit:** Perfect for misaligned or offset pipe connections
- • **Trusted Quality:** Fernco’s industry-leading reliability with 4.7⭐ from 176 pros
- • **Seamless Pipe Connection:** Effortlessly joins 3" to 4" pipes with flexible precision
- • **Corrosion-Free Durability:** All-elastomeric PVC build means zero rust, zero worries
- • **Lightweight & Easy Install:** Under 1 lb for quick, hassle-free setup

## Overview

The Fernco 1056-43 is a 4x3 inch flexible, no-metal pipe coupling designed to connect misaligned 3" and 4" pipes effortlessly. Made from durable elastomeric PVC, it resists corrosion and weighs just 0.89 lbs for easy installation. Trusted by professionals with a 4.7-star rating, it’s the go-to solution for reliable, flexible plumbing connections.

## Description

Fernco 1056-43 Coupling Flex 4X3 No Metal

Review: High quality - High quality. I have not used on my project yet, but this will certainly do the job.
Review: acople un drenaje de cuarto de lavado de 3" al drenaje principal del patio que es de 4" PVC - me resolvio el problema del desalineamiento en una instalacion donde tenia que insertar la descarga de un cuarto de lavado de 3" en un ramal de drenaje de 4" que corre hacia un registro en el patio de la casa. Quedo excelente muy buena alternativa de solucion. PVC ambos drenajes

## Features

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQWWLS |
| Best Sellers Rank | 229,339 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 160 in Tube Fitting Reducers |
| Brand | Fernco |
| Colour | Black |
| Connector Type | Reducer |
| Connector type | Reducer |
| Customer Reviews | 4.7 out of 5 stars 176 Reviews |
| Exterior Finish | Black |
| Global Trade Identification Number | 00018578000117 |
| Included Components | Fernco 1056-43 Coupling Flex 4X3 No Metal |
| Item Dimensions | 23.5 x 23.5 x 15.2 centimetres |
| Item Type Name | Fernco 1056-43 Coupling Flex 4X3 No Metal |
| Item Weight | 0.89 Pounds |
| Item dimensions L x W x H | 23.5 x 23.5 x 15.2 centimetres |
| Manufacturer | Fernco Inc. |
| Material | Elastomeric PVC Stainless Steel |
| Model Number | 1056-43 |
| Number of Pieces | 1 |
| Size | 4 x 3 Inch |
| Thread Size | 4 inch |
| Thread Type | NPTF |
| UPC | 018578000117 |
| Unit Count | 1.0 count |

## Product Details

- **Size:** 4 x 3 Inch
- **Material:** Elastomeric PVC Stainless Steel
- **Brand:** Fernco
- **Colour:** Black
- **Item dimensions L x W x H:** 23.5 x 23.5 x 15.2 centimetres
- **Connector type:** Reducer
- **Thread size:** 4 inch
- **Exterior finish:** Black
- **Thread type:** NPTF
- **Item weight:** 0.89 Pounds

## Images

![Fernco P1056-43 4 3-Inch Stock Coupling 1056-43 Flex 4X3 No Metal, 120 V, Black, 4 x 3 Inch - Image 1](https://m.media-amazon.com/images/I/51IMEdr8iPL.jpg)

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ High quality
*by T***R on 26 November 2025*

High quality. I have not used on my project yet, but this will certainly do the job.

### ⭐⭐⭐⭐⭐ acople un drenaje de cuarto de lavado de 3" al drenaje principal del patio que es de 4" PVC
*by L***� on 22 July 2021*

me resolvio el problema del desalineamiento en una instalacion donde tenia que insertar la descarga de un cuarto de lavado de 3" en un ramal de drenaje de 4" que corre hacia un registro en el patio de la casa. Quedo excelente muy buena alternativa de solucion. PVC ambos drenajes

### ⭐⭐⭐⭐⭐ exactly as advertised
*by A***R on 8 May 2025*

exactly as described and currently in use. no issues to install.

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-04*