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 like a pro—fast, flexible, and fail-proof!

MADE IN THE USA - Crafted with premium elastomeric PVC and rust-proof clamps for unmatched reliability.
UNDERGROUND READY - Built tough for underground use, trusted by professionals since 1964.
LEAK PROOF CONFIDENCE - Stainless steel bands ensure a positive, durable seal that stands the test of time.
PRO GRADE VERSATILITY - Seamlessly connects PVC, cast iron, copper, steel & lead pipes for any project.
EFFORTLESS INSTALLATION - Slide on, tighten with screwdriver, nut driver, or socket wrench—no primer or glue needed.

The Fernco P1056-64 6" x 4" stock coupling is a durable, flexible PVC connector designed for quick, reliable plumbing connections across multiple pipe materials. Featuring corrosion-resistant stainless steel clamps and a tool-friendly installation process, it’s engineered for both above-ground and underground applications. Proudly made in the USA since 1964, this coupling delivers professional-grade performance for vent, drain, sewer, and waste piping projects.

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Size	6" x 4"
Material	Polyvinyl Chloride
Brand	Fernco
Colour	black
Item dimensions L x W x H	12.2 x 17.3 x 14.1 Centimeters
Connector Type	Coupling
Thread Size	6.85 inches
Exterior Finish	black
Thread Type	NPT
Item Weight	272 g
Number of Pieces	1
Global Trade Identification Number	00018578000131, 00018578015586
Manufacturer	Fernco Inc.
UPC	018578015586 018578000131
Country of Origin	USA
Item model number	1056-64
Product Dimensions	12.19 x 17.3 x 14.12 cm; 272.16 g
ASIN	B000BQM0JC

Fernco Inc. P1056-64 6-Inch by 4-Inch Stock Coupling

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