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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🔧 Connect with confidence — the flexible future of pipe coupling!

VOLTAGE READY DESIGN - Rated for 120V applications, adding an extra layer of safety and reliability.
COMPACT LIGHTWEIGHT - Weighs just 404g with a sleek black finish for discreet installation.
TRUSTED BRAND QUALITY - Fernco’s industry-leading craftsmanship guarantees performance you can count on.
METAL FREE FLEXIBILITY - Elastomeric PVC ensures corrosion resistance and long-lasting durability.
SEAMLESS PIPE CONNECTION - Effortlessly links 4-inch to 3-inch pipes with precision fit.

The Fernco 1056-43 is a 4x3 inch flexible, metal-free pipe coupling made from durable elastomeric PVC. Rated for 120 volts, it offers a corrosion-resistant, lightweight solution for securely connecting pipes, backed by Fernco’s trusted quality standards.

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Manufacturer	Fernco Inc.
Part Number	1056-43
Product Dimensions	23.55 x 23.55 x 15.21 cm; 403.7 g
Item model number	1056-43
Size	4 x 3 Inch
Colour	Black
Material	Elastomeric PVC Stainless Steel
Voltage	120 Volts
Item Package Quantity	1
Number of Pieces	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
Item Weight	404 g

Fernco P1056-43 4 3-Inch Stock Coupling 1056-43 Flex 4X3 No Metal, 120 V, Black, 4 x 3 Inch

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