will this work on connecting a 6" cast iron to a 4" clay sewer line??

No, the 4" side on the P1056-64 is a nominal 4.46" inside diameter according to Fernco so it too small for 4" clay. The Fernco 1002-46 is designed for 6" PVC/cast iron to 4" clay and according to Fernco.com has a 6.39" by 5.18" inside diameter. Haven't worked with clay pipe but according to the sizing information from the Fernco site, any adapter with a clay connection requires that side of the adapter to be sized just for clay. Hope this helps.

Will this work on connecting a 6" dsw sch 40 pvc pipe to a sdr 35 4" pipe?

It will work but because sdr 35 is thinner wall than sch 40 be careful not to over tighten the connection to the 35.

What are the inner diameter dimensions?

Its difficult to measure as it is flexible and not perfectly round when not installed on a pipe. As close as I can get the inside diameters are 4 1/2 and 6 1/2 inches. Fits 4 inch schedule 40 PVC and the top fitting on a IBC container which is what I used it for.

12"coupling reduce to 6"

No. Mine fit loosely on an 8" to 6".

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描述

🔗 Connect with confidence—flexibility meets durability!

RELIABLE SEAL - Engineered to provide a positive, leak-proof seal for vent, drain, sewer, and waste piping.
TRUSTED LEGACY - Manufactured by Fernco, a USA-based industry leader since 1964, guaranteeing quality and innovation.
EFFORTLESS INSTALLATION - Fast, tool-friendly setup with just a screwdriver, nut driver, or socket wrench—no plumber needed.
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron, PVC, steel, copper, and lead pipes for ultimate versatility.
DURABLE UNDERGROUND RATED - Built tough to withstand underground conditions, ensuring long-lasting performance.

The Fernco 1056-64 is a 6" x 4" flexible PVC pipe coupling designed to connect multiple pipe materials including cast iron, PVC, steel, copper, and lead. It offers quick installation using common tools, a reliable leak-proof seal for various piping systems, and is rated for underground use. Manufactured by Fernco, a trusted USA brand since 1964, this coupling combines durability with versatility for professional-grade plumbing solutions.

规格

Size	6" x 4"
Material	Polyvinyl Chloride
Brand	Fernco
Color	Black
Item dimensions L x W x H	4.8 x 6.81 x 5.56 inches
Connector Type	Coupling
Thread Size	6.85 inches
Exterior Finish	Black
Thread Type	NPT
Item Weight	0.6 Pounds
Number of Pieces	1
Global Trade Identification Number	00018578000131, 00018578015586
Manufacturer	Fernco Inc.
UPC	018578015586 018578000131
Part Number	P1056-64
Item Weight	9.6 ounces
Product Dimensions	4.8 x 6.81 x 5.56 inches
Item model number	1056-64
Is Discontinued By Manufacturer	No
Shape	shape
Voltage	120 Volts
Item Package Quantity	1
Water Consumption	1 Gallons
Number of Handles	1
Measurement System	inch
Included Components	P1056-64 Flexible PVC Pipe Coupling
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty