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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Supply Giant 6I46 Flexible PVC Coupling With Stainless Steel Clamps, 1.9" Inner diameter for 1-1/2" Nominal Pipe, Black

Supply Giant 6I46 Flexible PVC Coupling With Stainless Steel Clamps, 1.9" Inner diameter for 1-1/2" Nominal Pipe, Black

Product ID: 64365140

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Details

Size
1.5 Inch
Material
Polyvinyl
Brand
SUPPLYGIANT
Color
Black
Item dimensions L x W x H
1.5 x 1.5 x 3
Connector Type
Flange

🌍ASTM C1173 & CSA B602 certified for underground use

🔧1.9" inner diameter fits 1.5" pipes

🛡️Stainless steel clamps for corrosion resistance

Description

🔗 Lock in reliability with Supply Giant’s flexible coupling – the pro’s secret to seamless plumbing!

CERTIFIED DURABILITY - Meets ASTM & CSA standards, approved for indoor/outdoor sewer systems
LEAK PROOF ROT PROOF - Engineered to prevent leaks and resist rot for lasting reliability
EFFORTLESS INSTALLATION - Flexible PVC design ensures quick, secure fitting for pros on the go
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron, plastic, copper, lead & steel pipes
BUILT TO LAST UNDERGROUND - Robust construction withstands soil conditions and underground pressures

The Supply Giant 6I46 Flexible PVC Coupling features a 1.9" inner diameter designed for 1.5" nominal pipes, equipped with stainless steel clamps for superior corrosion resistance. Compatible with multiple pipe materials including cast iron, plastic, copper, lead, and steel, it is leak-proof, rot-proof, and certified to ASTM C1173 and CSA B602 standards for both indoor and underground sewer and DWV systems. This coupling offers durable, flexible connections trusted by plumbing professionals and municipalities alike.

Specifications

Size	1.5 Inch
Material	Polyvinyl Chloride
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 5 inch
Exterior Finish	Brass
Thread Type	NPS
Number of Pieces	1
Global Trade Identification Number	00804595048245
Manufacturer	Supply Giant
UPC	804595048245
Part Number	6I46
Item Weight	5.3 ounces
Product Dimensions	1.5 x 1.5 x 3 inches
Item model number	6I46
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	3.06, 4822

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