What outside diameter pipe will these work on?

There for 6" pipe not sure if that's the inside diameter or outside. The are flexible can stretch a little.

Can you tell me what the inside diameter is?

Just under 6 inches. They are designed to fit 6 inch diameter PVC or iron.

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🔧 Connect with Confidence — The Pro’s Choice for Leak-Proof Plumbing!

TRUSTED INDUSTRY STANDARD - Meets ASTM, CSA, and UPC codes with rustproof clamps for professional-grade reliability.
BUILT TO LAST HALF A CENTURY - Engineered for a 50-year leak-proof service life with premium elastomeric PVC.
UNIVERSAL PIPE COMPATIBILITY - Seamlessly connects PVC, cast iron, copper, steel, and more for versatile plumbing solutions.
EFFORTLESS NO MESS INSTALLATION - Slide on and tighten stainless steel clamps—no primers, glues, or odors required.
PRECISION FIT FOR SECURE SEALING - Designed to fit pipe ODs from 6.30" to 6.80" ensuring a watertight connection every time.

The Fernco 1056-66 is a 6-inch flexible PVC pipe coupling designed for durable, leak-proof connections across multiple pipe materials including cast iron, plastic, and steel. Featuring a 50-year lifespan, corrosion-resistant stainless steel clamps, and easy no-mess installation, it meets key industry standards (ASTM, CSA, UPC) and fits pipe outside diameters from 6.30" to 6.80". Ideal for professional and DIY plumbing projects seeking reliable, versatile performance.

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AR$165377

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Manufacturer	Fernco Inc.
Part number	P1056-66
Item Weight	1.03 Kilograms
Product Dimensions	23.55 x 23.55 x 15.21 cm; 1.03 kg
Item model number	1056-66
Size	6" x 6"
Color	Black
Material	Polyvinyl Chloride
Shape	cylinder
Item Package Quantity	1
Number Of Pieces	1
Measurement System	inch
Included components	P1056-66 Flexible PVC Pipe Coupling
Batteries Included?	No
Batteries Required?	No

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

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