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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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"

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"

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

🔥140°F intermittent operating temp

🔧Universal pipe compatibility

🛡️300-grade stainless steel bands

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VT8528

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect with confidence—where durability meets versatility!

COMPACT YET POWERFUL - Fits pipes from 2.15" to 2.5" and 1.7" to 1.95" OD with a max test pressure of 4.3 PSI.
PLUG AND PLAY INSTALLATION - No glue or primer needed—get your plumbing sealed fast and hassle-free.
INDUSTRIAL GRADE DURABILITY - Elastomeric PVC with stainless steel bands ensures leak-proof, chemical & root resistance.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA for over 60 years, a staple for pros and DIYers alike.
SEAMLESS MULTI MATERIAL CONNECTION - Effortlessly links cast iron, plastic, steel & copper pipes for ultimate versatility.

The Fernco GIDDS-301112 is a high-performance flexible coupling adapter designed to connect cast iron, plastic, steel, and copper pipes seamlessly in sewer and drain systems. Featuring elastomeric PVC construction reinforced with 300-grade stainless steel bands, it delivers leak-proof, chemical-resistant, and root-proof seals without the need for adhesives. Engineered for pipes ranging from 1.5" to 2" with a max test pressure of 4.3 PSI and intermittent temperature tolerance up to 140°F, this USA-made coupling offers professional-grade reliability and easy installation for both vertical and horizontal plumbing applications.

Specifications

ASIN	B00077PW40
Best Sellers Rank	380,932 in Garden ( See Top 100 in Garden ) 24,415 in Lawn & Garden Watering Equipment
Brand	Fernco
Colour	Black
Connector Type	Coupling
Country of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (267)
Exterior Finish	Stainless Steel
Global Trade Identification Number	00018578000049
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	Elastomeric PVC
Model Number	P1056-215
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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