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

Product ID: 67436439

Details

Brand
Fernco
Colour
Black
Connector type
Coupling
Exterior finish
Stainless
Item dimensions L x W x H
7.6 x 7.6 x
Item weight
23 g

🔗Fits 2" to 1.5" pipe diameters

🌡️140°F intermittent operating temp

🛠️300-grade stainless steel bands

¥5725

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Connect with Confidence — The Last Coupling You'll Ever Need!

DURABILITY YOU CAN TRUST - Built to withstand 4.3 PSI test pressure and harsh sewer gases for long-lasting performance.
EASY INSTALLATION NO FUSS - No primers or glues needed—get your plumbing system connected quickly and reliably.
MADE IN THE USA WITH LEGACY - Over 60 years of trusted manufacturing quality supporting your plumbing needs.
UNIVERSAL PIPE COMPATIBILITY - Seamlessly connects cast iron, plastic, steel & copper pipes for ultimate versatility.
LEAK PROOF CHEMICAL RESISTANT - Elastomeric PVC and stainless steel bands ensure a watertight, root-proof seal without glue.

The Fernco GIDDS-301112 is a premium 2" x 1.5" flexible coupling adapter designed to connect cast iron, plastic, steel, and copper pipes in sewer and drain systems. Featuring elastomeric PVC construction and 300-grade stainless steel bands, it delivers a leak-proof, chemical-resistant seal rated for 4.3 PSI and intermittent temperatures up to 140°F. Proudly made in the USA with over six decades of expertise, this coupling offers easy, glue-free installation and unmatched durability for professional and home plumbing applications.

Specifications

ASIN	B00077PW40
Best Sellers Rank	439,111 in Garden ( See Top 100 in Garden ) 30,108 in Lawn & Garden Watering Equipment
Brand	Fernco
Colour	Black
Connector Type	Coupling
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (267)
Exterior Finish	Stainless Steel
Global Trade Identification Number	00018578000049
Included Components	Fernco P1056-215
Item Dimensions	7.6 x 7.6 x 10.2 centimetres
Item Type Name	Sewer and Drain Coupler Adapter
Item Weight	23 g
Manufacturer	Fernco Inc.
Material	Carbon Steel, Stainless Steel
Model Number	P1056-215
Number of Packs	1
Number of Pieces	1
Part Number	P1056-215
Size	2" x 1-1/2"
Thread Type	NPT
UPC	018578000049
Unit Count	1.0 count

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