Will this work below 32 degrees?

No Plus they don't work very well at all.

How can i tell if this will fit around a 5" downspout

No it will not fit a 5 inch downspout. I bought it believing the other answer and learned the hard way that no matter how hard you stretch it, it won't fit.

What is the round plastic piece for? Does that go on it somehow?

I was totally unhappy with this product. Sorry, I don't remember the round piece. The unit did not stay attached nor did it unroll during a heavy rain.

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Frost King Automatic Easy-to-Install Downspout Extender for Draining Away Water, Fits All Standard Downspouts (White)

Frost King Automatic Easy-to-Install Downspout Extender for Draining Away Water, Fits All Standard Downspouts (White)

Product ID: 431673913

Details

Brand
Frost King
Colour
White
Item weight
0.01 Ounces
Manufacturer
THERMWELL CO
Material
Plastic
Mounting type
Floor Mount

💧Auto water drainage

📏Fits all standard downspouts

⚙️Tool-free install

383 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Keep your foundation dry, your worries away!

UNIVERSAL FIT - Designed to fit all standard downspouts for seamless integration.
SMART AUTO EXTEND - Automatically unrolls when it rains and retracts when dry—set it and forget it.
SLEEK WHITE FINISH - Clean, modern look that blends perfectly with your home exterior.
FOUNDATION PROTECTION - Directs water away from your foundation to prevent costly damage.
EFFORTLESS INSTALLATION - No tools needed—get it set up in minutes and skip the hassle.

The Frost King Automatic Downspout Extender is a white plastic, 4-foot-long solution that fits all standard downspouts. It automatically extends during rain to direct water away from your foundation and retracts when dry, offering a tool-free, easy installation to protect your home efficiently.

Specifications

ASIN	B07RZ43M1R
Brand Name	Frost King
Colour	White
Customer Reviews	3.2 3.2 out of 5 stars (1,598)
Global Trade Identification Number	00077578057569
Item Weight	0.01 Ounces
Manufacturer	THERMWELL PRODUCTS CO INC
Manufacturer Part Number	DE46WH
Material Type	Plastic
Model Number	DE46WH
Mounting Type	Floor Mount
Number of Items	1
Recommended Uses For Product	Draining water away from building foundations
Special Features	Automatic
UPC	077578057569
Unit Count	1.0 count

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