I have 3.25" pvc installed for a radon system. Will this sleeve work or do I need to get a 4" x 4"?

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.

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.

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.

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.

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.

will this fit over 4 inch pvc pipe

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.

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Description

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

TRUSTED LEGACY - From Fernco, a leader since 1964, guaranteeing quality and innovation
DURABLE FLEXIBILITY - Engineered with high-grade PVC for long-lasting, leak-proof performance
COMPACT LIGHTWEIGHT - Easy to handle and install with just 14.2 ounces of robust build
SEAMLESS PIPE CONNECTION - Effortlessly links 4-inch to 3-inch pipes with precision fit
CORROSION FREE RELIABILITY - Metal-free design eliminates rust, ensuring maintenance-free use

The Fernco 1056-43 Coupling Flex 4X3 No Metal is a high-quality, flexible pipe adapter designed to connect 4-inch to 3-inch pipes seamlessly. Made from durable polyvinyl chloride without any metal parts, it offers superior corrosion resistance and long-lasting reliability. Proudly manufactured in the USA by Fernco, a trusted name since 1964, this lightweight and compact coupling ensures easy installation and maintenance-free performance for professional and home plumbing needs.

Specifications

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	14.24 ounces
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

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