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

Q: 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.

Q: 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.

Q: 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.

Q: 12"coupling reduce to 6"

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

Product ID: 94850815

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Details

Size
6 inch
Material
Polyvinyl
Brand
Fernco
Colour
Black
Item dimensions L x W x H
12.2 x 17.3 x
Connector type
Coupling

🔧6.61" & 4.46" dual ID fit

♻️Chemical & sewer gas resistant

🛠️300 stainless steel clamps

Frequently Bought Together

Fernco 1056-64 6" x 4" Flexible Pipe Coupling (Connects Cast Iron, PVC, Steel or Lead)

Fernco 1056-66 6-in. Flexible PVC Pipe Coupling for Cast Iron/Plastic/Steel Plumbing Connections in Black

Fernco 1056-86 Flexible Pipe Coupling 8” CI/Plastic/Steel to 6” CI/Plastic/Steel

Description

🔩 Connect with confidence — the last coupling your plumbing will ever need!

BUILT TO ENDURE - Crafted from elastomeric PVC for a leak-proof, chemical-resistant seal that lasts decades.
UNIVERSAL FLEX FIT - Seamlessly connects pipes from 4.10" to 6.85" OD for ultimate versatility.
CODE APPROVED CONFIDENCE - Meets ASTM, CSA, and UPC standards ensuring professional-grade reliability.
TOOL FRIENDLY INSTALLATION - Quick, no-mess setup with corrosion-resistant stainless steel clamps—just a screwdriver needed.
MULTI MATERIAL COMPATIBILITY - Effortlessly joins PVC, cast iron, copper, steel, and lead pipes for all your plumbing needs.

The Fernco GIDDS-301118 P1056-64 is a 6-inch flexible pipe coupling designed for professional-grade plumbing connections. Featuring dual internal diameters (4.46" and 6.61") to fit a wide range of pipe sizes, it connects multiple pipe materials including PVC, cast iron, and steel. Made from durable elastomeric PVC with corrosion-resistant stainless steel clamps, it ensures a leak-proof, chemical-resistant seal that complies with ASTM, CSA, and UPC standards. Easy to install without messy adhesives, this coupling is built to last the lifetime of your plumbing system.

Specifications

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
Size	6 inch
Colour	Black
Material	Polyvinyl Chloride Stainless Steel
Shape	shape
Voltage	120 Volts
Item Package Quantity	1
Number of Pieces	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
Item Weight	272 g

Have a Question? See What Others Asked

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

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

What are the inner diameter dimensions?

12"coupling reduce to 6"

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