will this work to keep water from coming up the drain in the basement when city systems can't handle it?

Yes, I tested the silicone seal using a PVC tube and the Green Drain was able to hold back water up to 2.5' until it gave way to the water pressure. Without the center plug, a small amount of water drips through, but if a basement was flooding under 2.5' this would hold back the vast majority of water, preventing a lot of unnecessary water damage.

Can this be installed in clay tile?

If you are referring to a clay tile pipe then yes as long a it is a tigjt fit as clay has a tendency to wear faster vs steel and could be slightly bigger than 4”.

If it's just pushed in, how does it keep its position, could it just fall straight down a 2" straight pipe and get stuck?

Usually the 2 inch pipe is only a short pipe leading into a smaller pipe or a bend. If your drain is a straight 2 inch pipe the whole way down then this would not work for you. This drain is designed for showers or drains that should have a P Trap but don't.

What are the dimensions of the 2" unit?

it fits in a standard sched. 40 2" PVC pipe. so slightly over 2"

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Waterless Trap Seal, 3 Inch, Fitting Pipes with Diameters Between 68-80 mm

Waterless Trap Seal, 3 Inch, Fitting Pipes with Diameters Between 68-80 mm

Product ID: 31045027

Details

Brand
G Green Drain
Color
Black
Item Weight
0.1 Kilograms
Material
Silicone
Product Dimensions
3"W x 2"H

🌿Eco-friendly silicone design

💧34 GPM high flow rate

🛠️3-inch fitting for 68-80 mm pipes

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£42.56

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Seal the deal with innovation — no water, no worries!

COMPACT YET POWERFUL - Slim 51 mm height fits tight spaces without compromising performance.
ECO INNOVATIVE DESIGN - Patented waterless seal technology reduces water waste and environmental impact.
EFFORTLESS VERSATILITY - Fits a wide range of 68-80 mm pipes for seamless integration.
MAXIMIZED FLOW EFFICIENCY - Handles up to 34 gallons per minute to keep your drains clear and fast.
SIMPLE SECURE INSTALLATION - Silicone skirt ensures a perfect seal with easy screwdriver-assisted setup.

The G Green Drain Waterless Trap Seal is a patented, eco-friendly plumbing solution designed for 3-inch pipes with diameters between 68-80 mm. Featuring a compact 51 mm height and a robust 34 GPM flow rate, it offers easy installation and reliable drainage without water, reducing waste and enhancing hygiene in both residential and commercial settings.

Specifications

ASIN	B00W2FQX2U
Best Sellers Rank	#22,231 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #120 in Bathroom Sink & Bathtub Drain Strainers
Brand Name	G Green Drain
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (2,109)
Global Trade Identification Number	00864833000121
Item Dimensions W x H	3"W x 2"H
Item Weight	0.1 Kilograms
Manufacturer	Green Drain Inc
Manufacturer Part Number	GD103
Material Type	Silicone
Model Number	GD103
Number of Items	1
UPC	706927834352 864833000121
Unit Count	1.0 Count

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