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!

EASY INSTALLATION - Lightweight 9.6 oz design with clear size markings for quick setup
DURABLE LEAK PROOF - Flexible PVC with stainless clamps ensures rot-proof, sealed joints
CERTIFIED RELIABILITY - Meets ASTM C1173 & CSA B602 standards for peace of mind
VERSATILE APPLICATION - Ideal for indoor/outdoor DWV and sewer systems, including underground
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron, plastic, copper, lead & steel pipes

The Supply Giant 6I48 Flexible PVC Coupling features a 3.5" inner diameter designed for 3" nominal pipes, reinforced with stainless steel clamps for superior corrosion resistance. Compatible with multiple pipe materials including cast iron and copper, it is leak-proof, rot-proof, and certified for underground use per ASTM C1173 and UPC standards. Lightweight and easy to install, this coupling is trusted by professionals for reliable, long-lasting plumbing and sewer connections.

Specifications

Size	3 Inch
Material	Polyvinyl Chloride
Brand	SUPPLYGIANT
Color	Black
Item dimensions L x W x H	3 x 3 x 3.5 inches
Connector Type	Flange
Thread Size	3 inch
Exterior Finish	Brass
Item Weight	9.6 ounces
Number of Pieces	1
Global Trade Identification Number	00804595048269
Manufacturer	Everflow
UPC	804595048269
Part Number	6I48
Product Dimensions	3 x 3 x 3.5 inches
Item model number	6I48
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	4824, 5.04

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