--- product_id: 37648909 title: "Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray" brand: "southwire" price: "$6.04" currency: USD in_stock: false url: https://mariana.desertcart.com/products/37648909-southwire-msbmmt3g-3-gang-multi-mount-device-box-with-depth store_origin: MP region: Northern Mariana Islands --- # 3-gang multi-mount design Adjustable depth for versatile installs 42lb heavy-duty strength Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray **Brand:** southwire **Price:** $6.04 **Availability:** ❌ Out of Stock ## Summary > ⚡ Power your space with precision and durability! ## Quick Answers - **What is this?** Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray by southwire - **How much does it cost?** $6.04 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [mariana.desertcart.com](https://mariana.desertcart.com/products/37648909-southwire-msbmmt3g-3-gang-multi-mount-device-box-with-depth) ## Best For - southwire enthusiasts ## Why This Product - Trusted southwire brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flex Your Setup:** Depth adjustable and multi-mount design supports both horizontal & vertical installs. - • **Smart Separation:** Low voltage dividers safely separate power and data lines for modern smart homes. - • **Certified Confidence:** UL Listed and RoHS compliant for trusted, professional-grade installations. - • **Cable Management Made Easy:** ½" knockouts compatible with blue tube or PVC conduit streamline your wiring. - • **Built to Last, Built to Perform:** Heavy-duty 42lb polycarbonate ensures durability for any project. ## Overview The Southwire MSBMMT3G is a 3-gang multi-mount electrical box crafted from high-impact polycarbonate, featuring adjustable depth and removable mounting blocks for flexible installation. It supports both horizontal and vertical mounting, includes ½" conduit knockouts, and built-in low voltage dividers for safe mixed voltage separation. UL Listed and RoHS compliant, it offers heavy-duty strength with a 42lb rating, making it ideal for professional-grade home theater, smart home, and electrical projects. ## Description Southwire’s thoughtful design includes ½" knockouts for quick conduit connections and built-in wall dividers to safely separate mixed voltages. That means you can run power and data lines in the same box without worry. ## Features - Designed for both horizontal and vertical installations, this low voltage mounting box includes removable nail tabs for easy metal stud mounting and top blocks for secure vertical placement—perfect for flexible home theater or TV setups. - Removable interior mounting blocks allow for increased cubic inch capacity, giving you more room for cables and connections without compromising safety or performance. - Includes ½" knockouts compatible with blue tube or PVC conduit, streamlining your cable management and ensuring a clean, professional installation every time. - Low voltage wall dividers enable safe separation of mixed voltages within the same box—ideal for combining power and data lines in modern smart home applications. - Made from high-impact polycarbonate and backed by UL Listing and RoHS compliance, this box includes heavy-duty mounting screws for secure installation and long-lasting reliability. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00H8NV1WS | | Best Sellers Rank | #4,862 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Electrical Outlet Boxes | | Brand | Southwire | | Brand Name | Southwire | | Color | Gray | | Customer Reviews | 4.6 out of 5 stars 144 Reviews | | Finish Type | Painted | | Global Trade Identification Number | 00784297017728 | | Included Components | MSBMMT3G | | Installation Type | Nail-On | | Item Dimensions D x W x H | 3.5"D x 5.9"W x 3.82"H | | Item Type Name | 3-GANG MULTI-MOUNT ELECTRICAL BOX | | Item Weight | 0.2 kg | | Manufacturer | Southwire | | Material | Polycarbonate | | Model Number | MSBMMT3G | | Number of Items | 1 | | Part Number | MSBMMT3G | | Product Dimensions | 3.5"D x 5.9"W x 3.82"H | | Specification Met | Ul | | Style | Multi-Mount | | UPC | 784297017728 | | Unit Count | 1 Count | ## Product Details - **Brand:** Southwire - **Color:** Gray - **Material:** Polycarbonate - **Product Dimensions:** 3.5"D x 5.9"W x 3.82"H - **Style:** Multi-Mount ## Images ![Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray - Image 1](https://m.media-amazon.com/images/I/61HF51BC8wL.jpg) ![Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray - Image 2](https://m.media-amazon.com/images/I/81QPANcF1YL.jpg) ![Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray - Image 3](https://m.media-amazon.com/images/I/81GnSOgpzGL.jpg) ![Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray - Image 4](https://m.media-amazon.com/images/I/81tW5+r52JL.jpg) ![Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray - Image 5](https://m.media-amazon.com/images/I/81A+GKj0ZKL.jpg) ## Available Options This product comes in different **Size, Number Of Items, Style** options. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://mariana.desertcart.com/products/37648909-southwire-msbmmt3g-3-gang-multi-mount-device-box-with-depth](https://mariana.desertcart.com/products/37648909-southwire-msbmmt3g-3-gang-multi-mount-device-box-with-depth) --- *Product available on Desertcart Northern Mariana Islands* *Store origin: MP* *Last updated: 2026-11-14*