---
product_id: 765588846
title: "FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING"
brand: "fernco"
price: "3912853₫"
currency: VND
in_stock: true
reviews_count: 5
category: "Fernco"
url: https://www.desertcart.vn/products/765588846-ferncop1056-43reducing-flexible-coupling-4x3-flexible-coupling
store_origin: VN
region: Vietnam
---

# FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING

**Brand:** fernco
**Price:** 3912853₫
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING by fernco
- **How much does it cost?** 3912853₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/765588846-ferncop1056-43reducing-flexible-coupling-4x3-flexible-coupling)

## Best For

- fernco enthusiasts

## Why This Product

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

## Description

desertcart.co.jp: FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING : Industrial & Scientific

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BQWWLS |
| Are Batteries Included | No |
| Brand | Fernco |
| Customer Reviews | 4.7 4.7 out of 5 stars (177) |
| Date First Available | September 15, 2013 |
| Item Weight | 404 g |
| Model Number | 1056-43 |
| Product Dimensions | 23.55 x 23.55 x 15.21 cm; 403.7 g |
| Quantity | 1 |
| Usage | カップリング |
| Voltage | 120 Volts |

## Product Details

- **Brand:** Fernco
- **Connector Type:** カップリング
- **Exterior Finish:** 銅
- **Global Trade Identification Number:** 00018578000117
- **Item Weight:** 0.89 Pounds
- **Item dimensions L x W x H:** 23.5 x 23.5 x 15.2 cm
- **Manufacturer:** Fernco
- **Number of Pieces:** 1
- **UPC:** 018578000117

## Images

![FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING - Image 1](https://m.media-amazon.com/images/I/61fRguyeu8L.jpg)
![FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING - Image 2](https://m.media-amazon.com/images/I/61Toq6o42LL.jpg)
![FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING - Image 3](https://m.media-amazon.com/images/I/61IfKAyhpwL.jpg)
![FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING - Image 4](https://m.media-amazon.com/images/I/71qmfHp69ZL.jpg)
![FerncoP1056-43Reducing Flexible Coupling - 4X3 FLEXIBLE COUPLING - Image 5](https://m.media-amazon.com/images/I/71tBvrMRkZL.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

### ⭐⭐⭐⭐⭐ Review
*by L***� on July 22, 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

### ⭐⭐⭐⭐⭐ Review
*by A***R on May 8, 2025*

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

### ⭐⭐⭐⭐⭐ Review
*by S***T on January 13, 2026*

Just as I expected, seems like good quality, used it to connect my radon mitigation fan to the pipe would buy again.

## 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 Vietnam*
*Store origin: VN*
*Last updated: 2026-03-02*