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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🔧 Connect with confidence—where durability meets versatility!

LEAK PROOF SEAL - Elastomeric PVC with stainless steel bands ensures zero leaks
EASY INSTALLATION - No glue or primer needed—save time and hassle
MADE IN USA LEGACY - Trusted quality with 60+ years of American manufacturing excellence
UNIVERSAL PIPE CONNECTOR - Seamlessly joins cast iron, plastic, steel & copper pipes
CHEMICAL ROOT RESISTANT - Built to withstand harsh sewer gases and root intrusion

The Fernco GIDDS-301112 is a premium 2" x 1.5" flexible coupling adapter designed for effortless, leak-proof connections between cast iron, plastic, steel, and copper pipes. Featuring elastomeric PVC construction and 300-grade stainless steel bands, it resists chemicals, sewer gases, and root intrusion while operating reliably up to 140°F. Proudly made in the USA, this coupling offers professional-grade durability and easy installation without glues or primers, making it the go-to choice for modern plumbing and drainage systems.

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TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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Manufacturer	Fernco Inc.
Part Number	P1056-215
Product Dimensions	7.62 x 7.62 x 10.16 cm; 22.68 g
Item model number	P1056-215
Size	2" x 1-1/2"
Colour	Black
Finish	Black
Material	Elastomeric PVC
Voltage	120 Volts
Item Package Quantity	1
Number of Pieces	1
Batteries included?	No
Batteries Required?	No
Item Weight	22.7 g

Fernco GIDDS-301112 Cast Iron, Plastic and Steel Pipe Flexible Coupling Connector Sewer and Drain Coupler Adapter, 120 V, Black, 2" x 1-1/2"

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