I know this is for cars, but what about it sitting in the hot sun or freezing cold inside the car? Does it need special protection?

Fire extinguishers are designed to fight fires, which are hot. What good would it do for an extinguisher to blow up when the temperature reaches nonlethal levels? You can bet that it gets a lot hotter inside a burning house than it does inside your car or truck on a sunny day. Look for one that displays the Underwriters Laboratory label (UL rated). The laboratory requires that extinguishers can be safely stored at minus-40 to plus-120 degrees, a standard that is sometimes posted on the extinguisher. But the laboratory also requires that extinguishers survive 175 degrees for seven days, which is not normally disclosed in product information. A quality, UL-listed extinguisher has a steel cylinder that is designed to withstand six times its normal pressure without bursting.

How does the mounting system work? What do you mount it to in your car? Do you have to drill holes or modify the car in some way?

To mount securely you would have to drill holes. This one is actually fairly small so you might be able to secure with those double sided tape pieces with the tabs on that can be removed damage free.

Does it have a pressure gauge?

Model AUTO5 does not have a pressure gauge. It has a pressure indicating stem (green in color) on the top of the head. If the stem is down (hidden) that indicates the pressure is low, possibly inoperable. If you look at pics 1 and 3, they show both sides of the head...ring-pin on one side, nothing on the other. More from First Alert: https://www.firstalert.com/product/auto-fire-extinguisher-ul-rated-5-bc-red/

how many pounds of chemicals inside?

The label states “2.43 lbs. + 2 oz.” of a bicarbonate. I don’t know why They express it in that fashion. Overall unit when filled is is 4 lbs.

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Description

🚗🔥 Stay ready, stay safe — your car’s ultimate fire defense!

MOUNT GO - Heavy-duty mounting bracket and strap keep your extinguisher secure and accessible.
SAFETY FIRST - Metal pull pin with tamper-proof seal prevents accidental discharge.
BUILT TO LAST - Corrosion-resistant metal head and gauge ensure reliability under pressure.
CLEAR READY - Waterproof, chemical-resistant label with easy 4-step instructions for instant action.
COMPACT POWERHOUSE - UL rated 5-B:C extinguisher fits easily in any vehicle trunk or cabin.

The First Alert AUTO5 Car Fire Extinguisher is a compact, UL rated 5-B:C unit designed specifically for automotive use. It effectively combats flammable liquid and electrical fires, featuring a durable corrosion-resistant metal head, an easy-to-read color-coded gauge, and a tamper-proof metal pull pin. Included is a heavy-duty mounting bracket and strap for secure placement in any vehicle. Backed by a 5-year limited warranty, this extinguisher combines trusted First Alert reliability with user-friendly design to keep you prepared on the road.

Specifications

Brand	First Alert
Style	Car Fire Extinguisher
Color	Red
Product Dimensions	2.9"D x 4.84"W x 3.43"H
Item Weight	2.7 Pounds
Alarm	it's designed to be a compact and portable fire extinguisher specifically for automotive use.
Global Trade Identification Number	10029054741025
Material	Plastic
Number of Items	1
Manufacturer	First Alert
UPC	029054741028 111012510002
Part Number	AUTO5
Item Weight	2.7 pounds
Item model number	AUTO5
Is Discontinued By Manufacturer	No
Pattern	Fire Extinguisher
Item Package Quantity	1
Number Of Pieces	1
Certification	not_applicable
Included Components	Fire Extinguisher, Mounting Bracket
Batteries Included?	No
Batteries Required?	No
Warranty Description	5-year limited

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