What are the ID of the 2 x 1 1/4 rubber coupling?

1 and 1/4 x 2 are the size if inner diameters

Is it possible to use for car exhaust

I wouldn't. Exhaust pipes get hot and this isn't heat resistant.

I want to know this answer as well. It doesn't say in the specs what temperature is allowed, neither transient nor continuous. From Wikipedia: The heat stability of raw PVC is very poor, so the addition of a heat stabilizer during the process is necessary in order to ensure the product's properties. Traditional product PVC has a maximum operating temperature around 60 °C (140 °F) when heat distortion begins to occur.[25] Melting temperatures range from 100 °C (212 °F) to 260 °C (500 °F) depending upon manufacture additives to the PVC. The linear expansion coefficient of rigid PVC is small and has good flame retardancy, the limiting oxygen index (LOI) being up to 45 or more. The LOI is the minimum concentration of oxygen, expressed as a percentage, that will support combustion of a polymer and noting that air has 20% content of oxygen.

2” to 1 1/4” adapter Is bigger inside opening than stated. Can a 1 1/4” p trap seal correctly?

I used to connect 2” to 1 1/2”. Both pipe were schedule 40. A P trap is normally a lighter schedule. You may need and adapter from 1 1/4” P trap to 1 1/4” schedule 40.

Supply Giant 6I52 Flexible PVC Reducing Coupling with Stainless Steel Clamps, 2.4" x 1.6" Inner Diameter for 2" x 1-1/4 Nominal Pipe, Black

Supply Giant 6I52 Flexible PVC Reducing Coupling with Stainless Steel Clamps, 2.4" x 1.6" Inner Diameter for 2" x 1-1/4 Nominal Pipe, Black

Product ID: 376641860

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Details

Brand
Supply Giant
Colour
Black
Item dimensions L x W x H
5.1 x 5.1 x
Material
Polyvinyl
Size
2 x 1-1/4

🌿PVC material resists chemicals & UV exposure

🔧2.4" x 1.6" inner diameter precision fit

🛡️Stainless steel clamps for corrosion resistance

Description

🔗 Connect with confidence — the flexible coupling that keeps your pipes leak-proof and future-ready!

CERTIFIED CODE READY - Meets ASTM C1173, CSA B602, and UPC standards for peace of mind
UNIVERSAL COMPATIBILITY - Seamlessly connects cast iron, copper, plastic & steel pipes
QUICK EASY INSTALLATION - Flexible design with stainless steel clamps saves time on every job
LEAK PROOF ROT PROOF SEAL - Engineered to prevent infiltration and exfiltration for lasting reliability
DURABLE OUTDOOR UNDERGROUND USE - PVC construction resists soil conditions, UV rays, and sewer gases

The Supply Giant 6I52 Flexible PVC Reducing Coupling features a 2.4" x 1.6" inner diameter designed for 2" x 1-1/4" nominal pipes. Made from resilient PVC with stainless steel clamps, it offers leak-proof, rot-proof connections compatible with multiple pipe materials. Certified to ASTM, CSA, and UPC standards, it’s ideal for indoor/outdoor drain, waste, vent, and sewer systems, ensuring durable, chemical- and UV-resistant performance for professional-grade plumbing solutions.

Specifications

ASIN	B07C7MT2GG
ASIN	B07C7MT2GG
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#147,593 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,283 in Industrial Pipe Fittings
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (635)
Customer reviews	4.5 4.5 out of 5 stars (635)
Date First Available	1 January 2024
Date First Available	1 January 2024
Finish	Black
Included components	Coupling
Item Package Quantity	1
Item Weight	150 g
Item model number	6I52
Item model number	6I52
Manufacturer	Everflow
Manufacturer	Everflow
Material	Polyvinyl Chloride
Measurement System	inch
Number Of Pieces	1
Part number	6I52
Product Dimensions	5.08 x 5.08 x 7.62 cm; 150 g
Product Dimensions	5.08 x 5.08 x 7.62 cm; 150 g
Shape	coupling
Size	2 x 1-1/4
Specification met	not_applicable
Style	Single Unit
Water Consumption	1 Gallons per Flush

Reviews

W**E

quality seems good

23.08.2025

C**N

Worked Great

22.11.2025

R**N

I ordered the wrong size - the diameter is the inside of the tube - it doesn't include the outer later. My mistake, I forgot and it was too big. lol I needed the next size down. All and all it was well made and all. I got a similar one - the right size from a local vendor. Same good quality with the rings. Use a mini ratchet not a screwdriver. Best of luck! May your pipes no longer leak.

12.12.2025

M**S

Had to reduce from 2 inch to 1 1/4 .inch down. Perfect fit.

1.08.2024

C**S

Perfect solution to resolve a challenging pipe connection.

29.01.2026

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