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.

Material	Silicone
Brand	G Green Drain
Product Dimensions	3"W x 2"H
Item Weight	0.1 Kilograms
UPC	706927834352 864833000121
Global Trade Identification Number	00864833000121
Number of Items	1
Manufacturer	Green Drain Inc
Part Number	GD103
Item Weight	3.52 ounces
Item model number	GD103
Is Discontinued By Manufacturer	No
Style	GD3
Finish	Polished
Item Package Quantity	1
Number of Handles	1
Special Features	Automatic Sealing Ribs
Batteries Included?	No
Batteries Required?	No

Waterless Trap Seal, 3 Inch

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