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, 4 Inch, Fitting Pipes with Diameters Between 95-104 mm

Waterless Trap Seal, 4 Inch, Fitting Pipes with Diameters Between 95-104 mm

Product ID: 82072198

Details

Brand
G Green Drain
Color
Black
Global Trade Identification Number
Material
Acrylonitrile
UPC
864833000145

💧73 GPM high flow rate

🔧4-inch universal fit (95-104 mm pipes)

♻️Eco-friendly, patented waterless design

NZ$156

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Description

♻️ Upgrade your drain game—no water, no worries, just pure innovation!

WATERLESS INNOVATION - Patented silicone skirt technology eliminates water traps, preventing odors and saving water.
EFFORTLESS UNIVERSAL FIT - Seamlessly connects with pipes from 95 to 104 mm, ensuring hassle-free installation every time.
MAXIMIZED FLOW EFFICIENCY - Handles up to 73 gallons per minute, keeping your drains clear and your space worry-free.
BUILT FOR DEMANDING SPACES - Engineered for commercial, industrial, and large residential use—durability meets performance.
ECO CONSCIOUS COST EFFECTIVE - Reduce water waste and maintenance costs with a smart, sustainable plumbing upgrade.

The G Green Drain Waterless Trap Seal is a 4-inch plumbing solution designed for pipes between 95-104 mm diameter. Featuring a 73 GPM flow rate and patented silicone skirt technology, it prevents odors without using water, making it ideal for commercial and large residential applications. Crafted from durable ABS material, it offers an eco-friendly, cost-effective alternative to traditional traps.

Specifications

ASIN	B00W2FUA92
Best Sellers Rank	#10,758 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #65 in Bathroom Sink & Bathtub Drain Strainers
Brand Name	G Green Drain
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (2,118)
Global Trade Identification Number	00864833000145
Manufacturer	Green Drain Inc
Manufacturer Part Number	GD104
Material Type	Acrylonitrile Butadiene Styrene
Model Number	GD104
Number of Items	1
UPC	864833000145
Unit Count	1 Count

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NZ$156

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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