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Masonry Boxes and Extensions

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  • Two Gang Masonry Box Extension, 2-1/2" Deep with Conduit Knockouts
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    Two Gang Masonry Box Extension, 2-1/2" Deep with Conduit Knockouts

    GI-TBX-225
    $21.60
    MSRP: $38.67
    The Garvin TBX-225 Two Gang Masonry Box Extension is designed to provide additional space and accessibility for electrical wiring in masonry applications. This 2-1/2" deep extension is equipped with conduit knockouts, enhancing the functionality and...
    Qty in Cart: 0
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    $21.60
    MSRP: $38.67
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  • Masonry Box Extension Ring, Four Gang, 3-1/2 Inch
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    Masonry Box Extension Ring, Four Gang, 3-1/2 Inch

    GI-TBX-435
    $44.10
    MSRP: $78.82
    Enhance your electrical installations with the Masonry Box Extension Ring. This four-gang, 3-1/2 inch extension is designed to increase the capacity of your existing masonry box, providing additional space for wiring and electrical devices. Key...
    Qty in Cart: 0
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    $44.10
    MSRP: $78.82
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  • Mason Box Extension Ring, 3-1/2 Inch Depth
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    Mason Box Extension Ring, 3-1/2 Inch Depth

    GI-TBX-135
    $21.00
    MSRP: $37.62
    This Mason Box Extension Ring provides a simple and efficient solution for adding extra wiring space to your existing mason box setup. Part of Garvin Industries' reliable electrical accessories, it ensures compliance with electrical codes and...
    Qty in Cart: 0
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    $21.00
    MSRP: $37.62
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  • Garvin Industries 3" x 2" Bracketed Switch Box, 2-3/4" Deep, Gangable, Flat Bracket, Conduit KO's
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    Garvin Industries 3" x 2" Bracketed Switch Box, 2-3/4" Deep, Gangable, Flat Bracket, Conduit KO's

    GI-G602-F
    $4.65
    MSRP: $12.71
    The Garvin Industries G602-F is a versatile 3" x 2" gangable switch box, designed for easy installation of multiple switches or devices. Its 2-3/4" depth and flat vertical bracket make it a reliable choice for a variety of electrical projects, while...
    Qty in Cart: 0
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    $4.65
    MSRP: $12.71
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  • 4" Square Device Ring Voltage Partition
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    4IN Low Voltage Box Partition, 2-1/8D, 1/2" - 1" Range

    GI-LVP41D
    $3.40
    MSRP: $13.96
    This 4-inch Low Voltage Box Partition is designed to enhance cable management and installation neatness in electrical setups. It's part of a series that emphasizes organization and efficiency in low voltage installations.Key Features and...
    Qty in Cart: 0
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    $3.40
    MSRP: $13.96
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  • Three Gang Masonry Box Cover, 3 Toggle
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    Three Gang Masonry Box Cover, 3 Toggle

    GI-MBC3T
    $6.90
    MSRP: $12.36
    This Three Gang Masonry Box Cover with 3 Toggle configurations is crafted by Garvin Industries to provide robust protection and a precise fit for electrical installations within masonry structures.Key Features and BenefitsDesigned to cover three gang...
    Qty in Cart: 0
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    $6.90
    MSRP: $12.36
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  • One Gang Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's
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    One Gang Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-125
    $3.50
    MSRP: $12.07
    This Garvin Industries TB-125 one-gang masonry box is designed for durability and ease of installation in masonry applications. Its 2-1/2" depth accommodates various electrical devices and wiring configurations, while the integrated conduit...
    Qty in Cart: 0
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    $3.50
    MSRP: $12.07
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  • One Gang Masonry Box, 2-1/2" Deep, Gangable, With Conduit Knockouts
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    One Gang Masonry Box, 2-1/2" Deep, Gangable, With Conduit Knockouts

    GI-TB-125-G
    $3.75
    MSRP: $10.19
    This Garvin Industries TB-125-G One Gang Masonry Box is designed for solid and secure installation in masonry walls. Its 2-1/2" depth allows for accommodating a variety of electrical devices and wiring configurations, making it an ideal choice for...
    Qty in Cart: 0
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    $3.75
    MSRP: $10.19
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  • 3" x 2" Cut-In Switch Box, 2-1/2" Deep, Non-Gangable with Conduit KO's
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    3" x 2" Cut-In Switch Box, 2-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-125-OW
    $8.20
    MSRP: $20.01
    This 3" x 2" Cut-In Switch Box provides a reliable solution for electrical installations requiring a non-gangable enclosure with easy access to conduit systems. Designed to be 2-1/2" deep, it accommodates various wiring needs with efficiency and ease...
    Qty in Cart: 0
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    $8.20
    MSRP: $20.01
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  • One Gang Masonry Box, 3-1/2" Deep, Non-Gangable with Conduit KO's
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    One Gang Masonry Box, 3-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-135
    $3.90
    MSRP: $11.36
    This One Gang Masonry Box is designed for robustness and ease of installation within masonry structures. Its 3-1/2" depth provides ample space for wiring and electrical components. Key Features and Benefits Durable construction...
    Qty in Cart: 0
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    $3.90
    MSRP: $11.36
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  • One Gang Masonry Box, 3-1/2" Deep, Gangable, Conduit KO's
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    One Gang Masonry Box, 3-1/2" Deep, Gangable, Conduit KO's

    GI-TB-135-G
    $3.90
    MSRP: $12.18
    This One Gang Masonry Box by Garvin Industries offers a dependable solution for electrical installations within masonry walls. With a 3-1/2" depth and gangable design, it provides ample space for wiring and making connections, while the integrated...
    Qty in Cart: 0
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    $3.90
    MSRP: $12.18
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  • Two Gang Masonry Box, 2-1/2" Deep, Non-Gangable, Conduit KO's
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    Two Gang Masonry Box, 2-1/2" Deep, Non-Gangable, Conduit KO's

    GI-TB-225
    $5.75
    MSRP: $17.05
    This Two Gang Masonry Box by Garvin Industries is an essential component for electrical installations within masonry walls. Its 2-1/2" depth accommodates various wiring configurations, making it a versatile choice for professionals. Key Features...
    Qty in Cart: 0
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    $5.75
    MSRP: $17.05
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  • Masonry Box, 3-1/2" Deep, Two Gang, Non-Gangable, Conduit KO's
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    Masonry Box, 3-1/2" Deep, Two Gang, Non-Gangable, Conduit KO's

    GI-TB-235
    $6.30
    MSRP: $18.85
    This Garvin Industries TB-235 masonry box is designed for solid and secure installation in masonry walls. Its 3-1/2" depth and two-gang design make it a versatile choice for electrical installations requiring multiple wiring configurations. ...
    Qty in Cart: 0
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    $6.30
    MSRP: $18.85
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  • Three Gang Bracketed Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's
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    Three Gang Bracketed Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-325-F
    $8.90
    MSRP: $27.11
    This Three Gang Bracketed Masonry Box is designed for robustness and ease of installation in masonry walls. Its 2-1/2" depth accommodates various wiring requirements, making it a versatile choice for electricians and contractors. Key Features...
    Qty in Cart: 0
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    Price:
    $8.90
    MSRP: $27.11
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  • Three Gang Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's
    Quick view

    Three Gang Masonry Box, 2-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-325
    $7.75
    MSRP: $20.71
    This Three Gang Masonry Box from Garvin Industries is a robust and practical solution for electrical installations in masonry walls. Its 2-1/2" depth accommodates various wiring configurations, making it a versatile choice for contractors and...
    Qty in Cart: 0
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    $7.75
    MSRP: $20.71
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  • Three Gang Masonry Box, 3-1/2" Deep, Non-Gangable with Conduit KO's
    Quick view

    Three Gang Masonry Box, 3-1/2" Deep, Non-Gangable with Conduit KO's

    GI-TB-335
    $8.50
    MSRP: $23.19
    This Three Gang Masonry Box is designed for robust and secure electrical installations in masonry walls. Its 3-1/2" depth provides ample space for wiring and electrical components, while the non-gangable configuration ensures a stable and permanent...
    Qty in Cart: 0
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    $8.50
    MSRP: $23.19
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  • Three Gang Masonry Box, 3-1/2" Deep, Non-Gangable, Conduit KO's
    Quick view

    Three Gang Masonry Box, 3-1/2" Deep, Non-Gangable, Conduit KO's

    GI-TB-335-F
    $18.30
    MSRP: $32.72
    This 3-gang masonry box from Garvin Industries is a robust solution for electrical installations within masonry and concrete structures. Its 3-1/2-inch depth accommodates a variety of devices and wiring complexities. Key Features and Benefits ...
    Qty in Cart: 0
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    $18.30
    MSRP: $32.72
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  • Five Gang Masonry Box, 3-1/2" Deep, Non-Gangable, with Conduit Knockouts
    Quick view

    Five Gang Masonry Box, 3-1/2" Deep, Non-Gangable, with Conduit Knockouts

    GI-TB-535
    $11.85
    MSRP: $33.58
    This Five Gang Masonry Box is a robust and secure solution for electrical installations within masonry walls. Its 3-1/2" depth provides ample space for wiring and electrical components, while the non-gangable design ensures a stable and permanent...
    Qty in Cart: 0
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    $11.85
    MSRP: $33.58
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  • Five Gang Masonry Box, 2-1/2" Deep, Non-Gangable, Conduit KO's
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    Five Gang Masonry Box, 2-1/2" Deep, Non-Gangable, Conduit KO's

    GI-TB-525
    $10.20
    MSRP: $29.74
    This Five Gang Masonry Box is a robust solution for electrical installations, featuring a 2-1/2" depth to accommodate multiple wires and devices. Its non-gangable design ensures a stable and secure fit into masonry walls, while the pre-punched...
    Qty in Cart: 0
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    $10.20
    MSRP: $29.74
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Masonry electrical boxes are designed for installation in concrete block (CMU), brick, poured concrete, and other masonry wall assemblies where no stud cavity exists for a standard box. Set into the masonry during construction or into a chase cut after the fact, they provide a flush, code-compliant wiring enclosure in wall materials that would otherwise require surface-mount conduit and exposed boxes.

Standard masonry boxes are single-gang and available in depths that accommodate standard conduit entry and device mounting requirements. Extensions, also called extension rings or mud rings, stack onto the face of the masonry box to bring the device face flush with tile, thick plaster, or other finish surfaces applied over the masonry substrate.

Masonry boxes are most common in commercial and industrial buildings, school construction, correctional facility projects, and exterior concrete wall applications. Most accept 1/2-inch and 3/4-inch conduit knockouts and are built from 16-gauge or heavier steel for structural integrity in masonry pours and high-traffic environments.

See also Square Boxes for standard stud-wall commercial applications and Commercial and Industrial Fittings for conduit termination hardware. Browse the full Metallic Boxes and Accessories catalog.