Inside diamater of the 8"?

Tube or coupling described as 8-In has an inside diameter of 8-In.

Inside diameter of 1 1/4

A 1-1/4” rubber sleeve will fit a 1-1/4 PVC pipe! A 1-1/4” PVC pipe has an OD of 1.6” and the sleeve has an ID of 1.6 “ so it fits perfectly over the pipe. It works that way with all the sizes - the PVC’s OD is ALWAYS the same as the sleeves ID. PVC pipe is sold based on it’s ID and it’s OD is always more. Fittings, connectors and sleeves are always sold by the size pipe they are meant to fit (typically slid over) so will have a larger ID than the pipes announced size. Ex: 1-1/2” PVC is 1-1/2” ID but 1.9” OD. You would need to buy a 1-1/2” rubber sleeve (with an ID of 1.9) to fit over the PVC tube! Don’t complicate it any more than the manufacturers already have! Pipe is sold by their ID and fittings are sold by the pipe size that they fit.

inside diameter of 4-inch?

The inside diameter is like 4.3 made to fit a 4 inch pipe

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Description

🔗 Connect with confidence — the flexible coupling that keeps your pipes tight and your projects tighter!

CERTIFIED QUALITY - Meets ASTM C1173 & CSA B602 standards, UPC approved for peace of mind
DURABLE RELIABLE - Leak-proof, rot-proof, and sealed tight for indoor/outdoor use
EASY IDENTIFICATION - Clearly marked with size, part number, and certifications for quick reference
VERSATILE APPLICATION - Perfect for DWV and sewer systems, including underground installations
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron, copper, plastic, lead & steel pipes

The Supply Giant 6I45 Flexible PVC Coupling features a 1.6" inner diameter designed for 1-1/4" nominal pipes, reinforced with stainless steel clamps for a leak-proof, rot-resistant connection. Compatible with a wide range of pipe materials, it’s certified to ASTM and CSA standards, making it ideal for durable, versatile use in drain, waste, vent, and sewer systems both indoors and underground.

Specifications

Size	1-1/4 Inch
Material	Rubber
Brand	SUPPLYGIANT
Color	Black
Item dimensions L x W x H	1.5 x 1.5 x 3 inches
Connector Type	Flange
Thread Size	1.25 inch
Exterior Finish	Brass
Item Weight	1.6 ounces
Number of Pieces	1
Global Trade Identification Number	00804595048238
Manufacturer	Everflow
UPC	804595048238
Part Number	6I45
Product Dimensions	1.5 x 1.5 x 3 inches
Item model number	6I45
Is Discontinued By Manufacturer	No
Style	Single Unit
Item Package Quantity	1
Water Consumption	1 Gallons per Flush
Measurement System	inch
Certification	not_applicable
Included Components	Coupling
Batteries Included?	No
Batteries Required?	No
Warranty Description	4.92, 4829

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