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!

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Oatey 4013846 2 in. Dia. Plastic General Purpose Floor Drain, Black | Seal for 2-Inch Shower, Floor drains Comes in a black finish

Oatey 4013846 2 in. Dia. Plastic General Purpose Floor Drain, Black | Seal for 2-Inch Shower, Floor drains Comes in a black finish

Product ID: 313384290

Details

Brand
Oatey
Item Form
item_form
Item dimensions L x W x H
9.5 x 4 x 8
Material
Rubber
Style
2 Inch Shower

💧Continuous drainage, no pooling

🔧Tool-free, hassle-free install

🚫One-way valve blocks odors & pests

₹ 4803

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚿 Keep it fresh, flow smooth, install easy—your drain’s new best friend!

QUICK EASY SETUP - Tool-free installation means no extra hassle or expensive plumber visits—get it done in minutes.
SLEEK BLACK FINISH - Modern black design blends seamlessly with contemporary bathroom and utility room aesthetics.
EFFORTLESS DRAINAGE - Designed for continuous water flow, preventing pooling or ponding that can cause damage or delays.
ODOR PEST DEFENSE - One-way valve seals out unwanted sewer smells and insects, keeping your space fresh and hygienic.
VERSATILE PLACEMENT - Perfect for basements, laundry rooms, and showers—adaptable to multiple home environments.

The Oatey 2-inch Plastic General Purpose Floor Drain features a one-way valve that prevents sewer odors and insects from entering your home. Its design ensures continuous drainage without water pooling, ideal for showers, basements, and laundry rooms. The tool-free installation and sleek black finish make it a practical and stylish upgrade for any modern home plumbing setup.

Specifications

ASIN	B091S43BTW
Best Sellers Rank	#143,107 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #604 in Bathroom Sink & Bathtub Drain Strainers
Brand Name	Oatey
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (230)
Global Trade Identification Number	00038753437453
Included Components	Oatey - 43745
Item Dimensions	9.5 x 4 x 8 inches
Item Form	item_form
Item Type Name	Oatey - 43745
Manufacturer	Oatey
Material Type	Rubber
Model	Oatey - 43745
Number of Items	1
Number of Packs	1
Part Number	43745
Style Name	2 Inch Shower and Floor Drain
UPC	038753437453
Unit Count	1 Count
Warranty Description	Warranty.

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