Can I add a GFCI from this junction box?

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How can I wire my Nest Power Connect with this install?
Discussion on Google Nest products, including installation and configuration.Why LED bulb flickers with Caseta Dimmer?
A place to discuss Lutron product usage, installation, and support.Which LED bulbs do not cause jumpings when dimming?
A place to discuss Lutron product usage, installation, and support.What’s this piece of concrete for at the bottom of my front porch wall?

A place for **construction professionals only** to discuss the industry. Anybody working or interested in working in this field is welcome! Carpentry, concrete, steel, plumbing, HVAC, electrical, landscaping, equipment operators, etc. Those with DIY or homeowner-type questions should use subreddits such as /r/DIY. Those posts will be removed.
Why the discoloration on that molding?
r/HomeMaintenance is a subreddit dedicated to helping homeowners, renters, and DIYers with questions, advice, and troubleshooting related to maintaining, repairing, and improving residential homes or even if you're a renter!Black cable found in basement, connected to gray box outside house. Plug has 3 pins and an inscription on it. What is it?
Black cable with 3 pins found in basement, connects to a gray box outside.
For the identification of mysterious objectsHow do you remove plug from which cap does not unscrew?
A place for plumbing advice and help. Do not advertise or try to compare pricing.Water sipping into basement from under the porch. How to remediate?
r/HomeMaintenance is a subreddit dedicated to helping homeowners, renters, and DIYers with questions, advice, and troubleshooting related to maintaining, repairing, and improving residential homes or even if you're a renter!What is this small black springy thing I found in my office?

For the identification of mysterious objects
For those chasing rates and bonus, how do you manage your accounts?
Learn about budgeting, saving, getting out of debt, credit, investing, and retirement planning. Join our community, read the PF Wiki, and get on top of your finances!Lender won’t allow moving title to living trust
Trusts and estates, probate, estate planning, asset protection, elder law. Please specify the state your issue is located in. We have restricted comments to approved users. If you'd like to comment, see the sticky and message the mods.One thermostat heats whole house despite other thermostats being off. Help!
A place for homeowners, renters, tenants, business owners or anyone with a general question about their HVAC system. Please read rules before posting!Why auto-off is auto schedule is disabled?
Discussion on Google Nest products, including installation and configuration.Wife ate the curb. Still safe to drive or need to replace?

Get the most out of your tires with tips and advice from experts
Temp Sensor shows offline on the main screen but still works!
Discussion on Google Nest products, including installation and configuration.Could anyone help me understand how deep is this? Does it look like I touched the primer? Any advice on what I'd need to repair it myself?

Discussion among Autobody enthusiasts, anyone wanting to become more aware of processes and what it takes to fix automobiles. If you are here for an Estimate WE DON'T DO ESTIMATES HERE! You will be banned, your post deleted. Just cause you saw it on Youtube doesn't mean its the right way to do it.