Will this work on an old drain pipe with a 2 1/2 inch inside diameter pipe?

No, this would not fit on a 2.5 inside diameter.

Does it work in a shower drain without a p trap?

My guess is that it should work in your shower drain. A P-trap prevents sewer gasses from entering the home. When full of water it is nothing more than a drain. Give it a try - can;t hurt. VERY pleased with the performance of our seal!

Oatey 43745 Seal for 2 Inch Shower and Floor Drain, Black

Oatey 43745 Seal for 2 Inch Shower and Floor Drain, Black

Product ID: 313384292

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Details

Brand
Oatey
Colour
Black
Finish type
Brushed
Material
Plastic
Special feature
Odor proof

🛁2-inch perfect fit

⚙️Durable plastic build

🛡️Odor-proof seal

Description

🛁 Seal the deal on freshness and style!

PRECISION 2 INCH FIT - Seamlessly integrates with standard shower and floor drains for hassle-free installation.
ODOR PROOF TECHNOLOGY - Keeps your space fresh by blocking unpleasant smells effectively.
TRUSTED BRAND RELIABILITY - Oatey’s proven quality ensures peace of mind with every use.
SLEEK BLACK BRUSHED FINISH - Adds a subtle, modern touch to your plumbing fixtures.
DURABLE PLASTIC CONSTRUCTION - Engineered for long-lasting performance and resistance to wear.

The Oatey 43745 is a black, 2-inch plastic seal designed for shower and floor drains. Featuring an odor-proof design and a brushed finish, it offers durable, reliable protection against unwanted smells while fitting standard drain sizes. Trusted by professionals and DIYers alike, it’s a simple upgrade that keeps your space fresh and functional.

Specifications

ASIN	B091S43BTW
Best Sellers Rank	1,157,671 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,340 in Drain Protectors 19,074 in Tap Parts
Brand	Oatey
Brand Name	Oatey
Colour	Black
Customer Reviews	4.5 out of 5 stars 282 Reviews
Finish Type	Brushed
Finish type	Brushed
Global Trade Identification Number	00038753437453
Included Components	Oatey - 43745
Item Type Name	Oatey - 43745
Manufacturer	Oatey
Material	Plastic
Material Type	Plastic
Product Style	2 Inch Shower and Floor Drain
Special Features	Odor proof
Special feature	Odor proof
Style	2 Inch Shower and Floor Drain
UPC	038753437453
Unit Count	1.0 Count

Reviews

G**R

I works very well

28.06.2024

D**D

Good product

8.01.2026

S**O

No more drain smells!

4.12.2024

G**G

Exactly what I needed

3.10.2023

S**.

Happy i kept!

3.12.2025

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