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

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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

📏Fits all standard downspouts

⚙️Automatic roll-out and retraction

🛠️Tool-free easy installation

€ 54.84

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay dry, stay smart — the downspout extender that works while you relax!

SLEEK WHITE FINISH - Blends cleanly with your home exterior for a polished, professional look.
SMART WATER MANAGEMENT - Automatically extends when it rains and retracts when dry—effortless protection.
PROTECT YOUR FOUNDATION - Directs water away from your home’s base to prevent costly damage.
UNIVERSAL FIT ZERO HASSLE - Seamlessly compatible with all standard downspouts for instant upgrade.
INSTALL IN MINUTES NO TOOLS NEEDED - Designed for busy pros who value quick, tool-free setup.

The Frost King Automatic Downspout Extender is a white plastic accessory designed to fit all standard downspouts. It automatically extends during rain to channel water away from your foundation and retracts when dry, preventing water damage and lawn obstruction. Easy to install without tools, it offers a practical, low-maintenance solution for professional-grade home water management.

Specifications

ASIN	B07RZ43M1R
Brand Name	Frost King
Colour	White
Customer Reviews	3.2 3.2 out of 5 stars (1,604)
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
Size	8-1/2 in. W x 4 ft. L
Special Features	Automatic
UPC	077578057569
Unit Count	1.0 count

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