- 20% Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

(195 customer reviews)

Original price was: $21.13.Current price is: $17.00.

Original price was: $21.13.Current price is: $17.00.

Customer Favorite โ€” discover the Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire, built for performance and designed for life in the United States.

About Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4)

  • Heavy-Duty One-Piece Construction for Lasting Stability: Built with thick-wall molded PVC, this SmartBox offers superior rigidity and durability, making it ideal for residential and light commercial installations.
  • Secure Wire Entry with Top and Bottom Clamps: Wire entrance clamps located on both the top and bottom of the box ensure secure cable management and easy access during installation.
  • Versatile Mounting on Wood or Metal Studs: Designed to mount directly to wood or 25-gauge metal studs, this box adapts to new work or old work applications with ease.
  • UL Classified for 2-Hour Fire-Rated Walls: Provides peace of mind with UL classification for 2-hour fire-rated wall assemblies (excluding MSB4G), meeting safety standards for code compliance.
  • Includes Threaded Device Holes and Mounting Screws: Comes ready to install with 6-32 threaded device holes and 42 lb. mounting screws for a secure, professional-grade setup.

The Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire combines reliability, modern design, and user-focused engineering. Perfect for everyday use, it delivers trusted results for American customers who value innovation.

Specification: Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

Material

Brand

โ€ŽSouthwire

Color

GRAY

Style

4pk, 1-Gang

Product Dimensions

3.39"D x 2.24"W x 3.82"H

Photos: Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

195 reviews for Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

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  1. Amazon Customer

    I hate the idea pf relying on the strength of drywall to hold an electrical box in place over the years as people plug & unplug stuff or bump into the cords coming out of it. These work great, just make sure you make your cutout right up against a stud. the ‘adjustable’ depth means you can hold them in whatever position you want against the stud before screwing in the integral screws. They worked fine for my walls (almost 1 inch thick in some places , only 1/2 in others).

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  2. Moz

    Nice and quick to install works well with the proper cover to meet code in Ontario if you’re not sure how to do this on your own please consult an electrician

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  3. Steven

    I have purchased this product prior to my order before. The price has jumped over 100%. I wish the manufacturers were more responsible.

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  4. Robert A. Gold Jr.

    I moved my electric dryer and needed to move the 220 outlet. I found a stud, cut a hole in the drywall, pulled the wire and then screwed the box to the stud. It is very solid and easy to use. The cable glands were a bit small for 10-2 w/g, but I made it fit.

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  5. Tad Burn

    Great box for new or existing construction. Rewired my house, and used these after removing all the old / original wiring from 1960’s. They work well because original boxes were on studs, but its impossible to hammer on a standard new-work box without opening more drywall, and cant use remodel box on a stud due to sheetrock tabs hitting stud. These work great for places you cant fit a hammer on new stuff ,and allow you to remount/ reuse same hole in sheetrock for remodel / re work.

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  6. Adam Zarett

    I prefer these boxes over the blue boxes with ears. These boxes mount solidly. These well-constructed electrical boxes are my go to boxes for remodeling.

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  7. Ron

    Very good quality and design. Easy to install on a stud. Great for new and reno projects.

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  8. Shelby

    This electrical box was just what I needed. It securely fastens to the frame from inside the box minimizing the amount of cutting I had to do in the siding and particle board. The J-box cover piece fit this electrical box perfectly so the whole assembly blended very well with the existing vinyl siding and securely hold the NEMA 6-20 socket I installed in it. The wiring went through the back of the box easily (15 Gauge) and gives me a very sturdy setup for my EV charger.

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  9. Shelby

    I used these boxes to install new light sconces onto the front of my garage where fixtures/wiring didn’t exist. They came packaged well and the boxes are MUCH better than the blue ones you can get at any box store. They are pretty stout plastic and with the screws, they make it easy to mount them in existing construction without having to make a larger hole than you need.

    I do recommend taking the screws out and running them in from the outside of the box in before attempting to final mount the box . . If you just try to screw them in, there is quite a bit of resistance from the tough plastic. So by running it in first, it kinda threads the box and allows it to thread easily once you actually mount the box.

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  10. Colorado Rat

    Purchased to use in a kitchen remodel so that I could replace existing boxes with boxes I could offset to match depth of new tile. The problem I had was that when screwing into the wall the box would tilt such that the box would extend out differently on each side. I tried using some shims which helped a little. They do install easily and after adding the screws they are very sturdy so if you are just installing to be flushed or slightly recessed they would be fine. I ended up installing flush/recessed and then found box extenders that worked very nice so that the box edge was flush with tile. I would not consider these adjustable but better that typical oldwork boxes if next to a stud.

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    Last updated on October 19, 2025 5:40 am Details
    Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire
    Madison Electric Products MSB1G4PK MSB1G Smart Depth Adjustable Box, 1 Gang, 18.5 cu. in. Gray (Pack of 4) by Southwire

    Original price was: $21.13.Current price is: $17.00.

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