Is this item 2 inch x 1-1/2 inch INSIDE diameter or OUTSIDE DIAMETER???

NEITHER. One end is sized to correctly fit over the outside diameter of 2 inch PVC pipe, and the other end is sized to correctly fit over the outside diameter of 1-1/2 inch PVC pipe. The sizes given are the INSIDE DIAMETERS of the PIPES. These are plumbing fittings, folks. That's how the plumbing world works.

Why do so many reviewers clearly not understand that the given sizes are the nominal sizes of the pipes that fit this fitting?

Because there are no accompanying dimensioned diagrams. Not everyone knows the origins of sizing pipes...we need Inside diameter and outside diameters measurements on printed pix.

What are the actual IDs of this part? The reviews indicate it’s marked incorrectly.

The reviewers are wrong because they don't understand how these things are sized. One end's ID is sized to correctly fit the OD of 2" ID Schedule 40 PVC pipe. This end is, therefore, 2.375" (2-3/8") ID, as it should be. The other end's ID is sized to correctly fit the OD of 1-1/2" ID Schedule 40 PVC pipe. Therefore, this end's ID is 1.875" (1-7/8") ID, also as it should be.

Is joint compound or Teflon tape needed when using this to join galvanized nipple with pvc trap?

No, you don't need to use any joint compound or Teflon tape.

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Description

🔗 Connect with confidence — the flexible coupling that never quits!

BUILT TO LAST - Rated for above/below ground use with 4.3 PSI max pressure and chemical resistance for long-term peace of mind.
NO MESS INSTALLATION - Forget glues and primers—install quickly with zero odors or hassle.
LEAK PROOF DURABILITY - Engineered elastomeric PVC and stainless steel bands ensure a permanent, watertight seal.
VERSATILE COMPATIBILITY - Seamlessly connects cast iron, plastic, steel & copper pipes with precision fit.
TRUSTED BY PROFESSIONALS - Preferred by plumbers and municipalities worldwide for reliable sewer and drain solutions.

The Fernco P1056-215 is a premium 2" x 1.5" flexible pipe coupling adapter designed to connect cast iron, plastic, steel, and copper pipes effortlessly. Crafted from durable elastomeric PVC with 300-grade stainless steel bands, it delivers a leak-proof, chemical-resistant seal ideal for sewer, drain, and plumbing systems. Proudly made in the USA with over 60 years of manufacturing excellence, this coupling supports quick, no-mess installation and meets ASTM, CSA, and UPC standards for reliable, long-lasting performance.

Specifications

Size	2" x 1-1/2"
Material	Polyvinyl Chloride, Stainless Steel
Brand	Fernco
Color	Black
Item dimensions L x W x H	3 x 3 x 4 inches
Connector Type	Reducer
Thread Size	2 inch
Exterior Finish	Stainless Steel
Item Weight	0.05 Pounds
Number of Pieces	1
Global Trade Identification Number	00018578000049
Manufacturer	Fernco Inc.
UPC	018578000049
Part Number	P1056-215
Item Weight	0.8 ounces
Product Dimensions	3 x 3 x 4 inches
Item model number	P1056-215
Is Discontinued By Manufacturer	No
Style	2-1/2"
Finish	Black
Voltage	120 Volts
Item Package Quantity	1
Measurement System	inch
Certification	Easy to use
Included Components	Fernco P1056-215 Flexible PVC Pipe Coupling
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

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