Will this fit over 3" cast iron to the bell/socket of 3" s40 backwater valve? Or is there another option that will work better?

This fitting is made to fit over 3" sch 40 pipe and over bell end of 3" fitting. Inside measurements of fitting are 3.5" and 4 " . Most 3 " cast is just under 3.5" OD. This fitting should work

Will this work for 3" copper to 3" pvc?

No it is made to go from 3" pipe to the socket of a 3" fitting. A regular 3" in fernco will tighten down enough to join 3" copper to 3" pvc sch 40

This coupling looks to big a little bigger on 1 end(which is what I need). What are the inner diameters on both ends please?

The smaller end is 3.5 inch I.D. and the bigger end is 4 inch I.D. , the smaller end fits over 3 inch sch. 40 PVC pipe and the bigger end fits over the bell end of a 3 inch sch. 40 fitting

What is the id of this? is it 3 inches? thanks

The inside diameter fits over a 3" PVC pipe perfectly.

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Fernco P1059-33 1059-33 Rubber Flexible Coupling Repair Fitting, Black, 3 Inch

Product ID: 291587357

Details

Brand
Fernco
Colour
Black
Item dimensions L x W x H
12.1 x 10.8 x
Material
Rubber
Size
3 Inch

🖤Durable black rubber finish

⚙️Socket-to-pipe seamless connection

🛠️3-inch flexible rubber coupling

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Description

🛠️ Fix it right, flex it tight — the pro’s choice for seamless repairs!

PRECISION FIT - 3-inch inner diameter perfectly matches standard pipe sizes for hassle-free installation.
SEAMLESS CONNECTION - Socket-to-pipe design guarantees a leak-resistant, secure coupling every time.
TRUSTED PERFORMANCE - Highly rated with 4.6 stars from over 200 users—join the community of pros who rely on Fernco.
ULTIMATE FLEXIBILITY - Rubber material ensures a resilient, flexible fit that adapts to your plumbing needs.
DURABILITY MEETS STYLE - Sleek black finish not only protects but adds a professional look to your repair setup.

The Fernco P1059-33 is a 3-inch rubber flexible coupling designed for reliable plumbing repairs. Featuring a socket-to-pipe connection and a durable black finish, it offers a secure, leak-resistant fit that adapts to your system’s needs. Trusted by professionals and DIYers alike, this coupling combines flexibility, precision, and durability in one compact repair fitting.

Specifications

ASIN	B000BQ8E1A
ASIN	B000BQ8E1A
Brand Name	Fernco
Color	Black
Connector Type	Coupling
Customer Reviews	4.6 4.6 out of 5 stars (201)
Customer reviews	4.6 4.6 out of 5 stars (201)
Date First Available	8 August 2012
Exterior Finish	Black
Global Trade Identification Number	00018578000568
Item Dimensions	12.1 x 10.8 x 10.2 centimeters
Item Type Name	Rubber Flexible Coupling Repair Fitting
Item Weight	0.01 Ounces
Item model number	P1059-33
Manufacturer	Fernco Inc.
Manufacturer	Fernco Inc.
Manufacturer Part Number	P1059-33
Material Type	Rubber
Model Number	P1059-33
Number of Packs	1
Number of Pieces	1
Product Dimensions	12.07 x 10.8 x 10.16 cm; 0.28 g
Size	3 Inch
Thread Size	3 inch
Thread Type	NPT
UPC	018578000568
Unit Count	1.0 Count

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€ 41.94

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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