Orbit MB 3-1/2" Deep Masonry Box with CKO, Pack of 100

Orbit MB 3-1/2" Deep Masonry Box with CKO

The Orbit MB is a 3-1/2" deep masonry box built with concentric knockouts (CKO) for flexible conduit entry into concrete, block, or brick wall construction. Available in gang configurations from 2-Gang to 3-Gang, this masonry box gives electrical contractors the depth and device capacity needed for durable, code-compliant installations in masonry structures. The 3-1/2" depth delivers ample interior volume for wiring, splices, and device mounting, while the selectable gang count lets installers match the box to job-specific device layouts, from a single grouped pair of devices up to a full 3-gang run of switches or receptacles in commercial and light industrial masonry walls.

Key Features

• Depth: 3-1/2" deep box body provides generous interior wiring space for multi-device installations regardless of gang count.
• Gang Configuration: Available in 2-Gang and 3-Gang options to accommodate multiple switches, receptacles, or devices side by side in a single box.
• Concentric Knockouts (CKO): Built-in CKO openings allow for flexible conduit sizing and entry points to match job-specific raceway requirements.
• Masonry-Rated Construction: Purpose-built for direct installation into concrete, block, or brick masonry walls.
• Ganged Device Support: Enables clean, organized mounting of multiple wiring devices in a single wall opening, reducing installation time versus separate single-gang boxes.

Technical Specifications

• Depth: 3-1/2"
• Gang Count Options: 2-Gang, 3-Gang
• Knockout Type: Concentric Knockouts (CKO)
• Box Type: Masonry Box

Typical Applications

• Concrete, Block, and Brick Wall Electrical Installations
• Commercial and Light Industrial Switch/Receptacle Gangs
• New Construction Masonry Wiring
• Multi-Device Wall Boxes for Panels and Control Stations
• Conduit-Fed Device Installations Requiring Flexible Knockout Sizing

Why Orbit?

Orbit's masonry box is engineered with the depth and gang flexibility electrical contractors need for reliable, code-compliant device installations directly into masonry walls. Whether the job calls for a 2-Gang or 3-Gang configuration, every Orbit MB box shares the same 3-1/2" depth and concentric knockout design, giving installers consistent flexibility on conduit entry without sacrificing the structural integrity of the box. This makes the Orbit MB family a dependable choice for professional masonry wiring projects across commercial and light industrial applications.