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PVC Old work Box extender Electrical Box

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

4.3
143
Review
 4.3 out of 5
143 Reviews


79% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

Customers overwhelmingly praise this electrical box extender for reliably bringing outlets flush with new wall surfaces after renovations like shiplap, tile, or cabinetry installations. Most highlight straightforward installation and appreciate its ability to meet electrical code requirements for safety and non-flammable coverage. The design accommodates varied wall thicknesses effectively. However, several note the included screws run too short to secure the extender properly, requiring separate purchases. Despite this frustration, most customers find it performs exactly as needed for retrofit scenarios.

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

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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Buy longer screws

Would Not Recommend

It sort of works, but the screws included don't reach and the value just isn't there, it's difficult to work with but seems to be the only option.

March 5, 2025
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