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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🔩 Connect with confidence—plumbing made flexible and flawless!

DURABLE BUILD - Crafted from high-grade ABS and stainless steel for long-lasting performance.
PRECISION FIT - 6.61 x 4.46 x 5.75 inches dimensions ensure a snug, leak-proof seal every time.
EFFORTLESS INSTALLATION - Designed for quick, hassle-free pipe connections—no expert needed.
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron and plastic pipes for versatile plumbing solutions.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA, guaranteeing quality and reliability.

The Fernco GIDDS-301118 P1056-64 is a 6-inch flexible reducing coupling featuring two stainless steel clamps, engineered to connect cast iron or plastic pipes effortlessly. Made in the USA from durable ABS and alloy materials, it ensures a secure, leak-proof fit with easy installation for professional-grade plumbing solutions.

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Manufacturer	Fernco Inc
Part Number	P1056-64
Product Dimensions	12.19 x 17.3 x 14.12 cm; 272.16 g
Item model number	1056-64
Colour	Black
Material	Acrylonitrile Butadiene Styrene, Alloy Steel, Cast Iron, Copper, High Density Polyethylene, Plastic, Polyvinyl Chloride, Stainless Steel
Voltage	120 Volts
Item Package Quantity	1
Number of Pieces	1
Number of handles	1
Batteries included?	No
Batteries Required?	No
Item Weight	272 g

Fernco GIDDS-301118 P1056-64 Stock Coupling, 120 V, Black, 6 inch

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