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Plastic Old work Box extender Electrical Box

Ratings & Reviews for CANTEX Plastic Old work Box extender Electrical Box

4.3
125
Review
 4.3 out of 5
125 Reviews


77% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

Customers overwhelmingly praise these electrical box extenders for bringing outlets flush with new wall surfaces like drywall, tile, and paneling. Most find installation quick and straightforward using just a screwdriver, with many describing the product as well-made and durable. Reviewers consistently report the extenders work perfectly for remodels and depth adjustments, extending boxes by about an inch. Some mention the included screws are too short and require purchasing longer 6-32 pan head screws separately. Despite minor hardware concerns and occasional compatibility issues, the vast majority consider the product reliable and effective for their renovation needs.

Customer review summary generated by AI, including incentivized reviews.
125 Customer Reviews

This box extender was perfect for what was needed.

Would Recommend
January 10, 2026
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Cheeper at a parts store

Would Recommend

Good for old work when your short on a job.

December 18, 2025
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Needed electrical extension

Would Recommend

Needed extension

October 22, 2025
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extender box

Would Recommend

works good

August 29, 2025
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Just ok

Would Recommend

The plastic old world electrical box extender does the job, but it feels like it’s missing the locking tabs that would make installation more secure. I was able to make it work, but it took some extra effort to get it to stay in place. Once installed it functions fine, but the design could definitely be improved for easier use.

August 17, 2025
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It would have been nice if the screws were longer.

Would Not Recommend

worked but...

August 1, 2025
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Cost is not acceptable.

Price was expensive for what it is.

July 31, 2025
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Poor design

Would Not Recommend

I added .75 wainscoting to a wall, so O had to extend a couple of outlets and bought these. Terrible design- it a few humps and lumps on the outside of the box which blocked me from inserting into the old box. Plus the screws that came with them were too short, and the way it was designed blocked my view of the holes in the wall box. I tried another brand from HD, and those had smooth sides, had much longer screws, fit into the old box easily and I could see the holes I needed to screw into. W...

July 18, 2025
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Worked well, but buy longer screws

This box was easy to install and worked as advertised. It brought my box flush with the interior of a new cabinet that was installed over the old outlet. HOWEVER, the screws included with the box are only as long as the depth of the extender and are useless if you need the full depth of the extension. I bought 2" 6 x 32 pan head machine screws (Item 409478) that were long enough to go through the extender and well into the old box. So, I had to spend an additional $3 for screws. Pretty pric...

July 7, 2025
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So not Buy it!!!

Would Not Recommend

This extension is crap. 1st: no instructions. 2nd: The holes to attach to an "Old Work" box are the same holes that hold the box in the wall. The screws included do not extend past the extension so I do not know how you are going to secure it to the box. You need 3" #6 screws to make this work. 3rd: If you get this attached, it is not stable. There should be a flange of some typr to rest against the original elec box.

June 22, 2025
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great product

Would Recommend

I bought these to extend the outlet boxes, and switch boxes on my kitchen walls so I can put up a back splash for my Wife

June 20, 2025
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Poor Value & Didn't Work For My Application

Would Not Recommend

High priced compared to a single gang box and not designed to accommodate 3/4 inch thick backsplash material...Returned.

June 18, 2025
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Check wiring length

Would Recommend

Havent installed them yet. But have used these in the past and work great.

April 20, 2025
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Worked great after tiling the back splash

Good works fine

April 11, 2025
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Worked and easy to install

Would Recommend

Worked as stated. I put some out a little.panels on a wall and needed to bring the outlet

March 20, 2025
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