7.5′ x 6′ Kundel Basic 3 Steel Trench Box

The Kundel Basic 3 7.5′ x 6′ steel trench box is a tall, short-length shield designed for localized utility excavations where substantial sidewall coverage is needed without the excavation footprint of a longer trench box.

This configuration combines a 90-inch sidewall height with a 6-foot overall length. It offers more longitudinal working room than the 7.5′ x 4′ and 7.5′ x 5′ Basic 3 models while remaining practical for utility spot repairs, service taps, valve access, localized utility exposure, and industrial maintenance work in restricted jobsites.

The 5-foot opening between spreaders may provide room for compatible pipe, valves, fittings, service connections, tools, and crew movement. The box should not be selected from its exterior dimensions alone. Customers must verify that the pipe, structure, utility component, equipment, and required working clearances fit the complete assembled configuration.

The Basic 3 uses 3-inch double-wall, solid-welded steel sidewalls built to provide dependable field durability. Its steel construction offers an alternative to aluminum trench boxes for municipalities, plumbing contractors, industrial maintenance departments, and underground utility crews using properly rated small excavators or rubber-tired backhoes.

This model has a listed weight of approximately 1,344 lbs and includes a knife-edge bottom to assist with manufacturer-approved positioning in compatible excavation conditions.

Each Basic 3 trench box requires four compatible spreaders. Spreaders are sold separately and must be selected according to the desired inside working width, excavation geometry, utility-component clearances, lifting equipment, and Kundel’s current tabulated data.

Key Benefits & Crew Efficiency

• 7.5-Foot Sidewall Height: Provides substantial vertical panel coverage for compatible utility and maintenance excavations.
• 6-Foot Overall Length: Offers useful working room while requiring less longitudinal excavation than the 8-, 10-, and 12-foot Basic 3 models.
• 5 Feet Between Spreaders: Provides an open work area for compatible valves, fittings, taps, service connections, tools, and utility components.
• Knife-Edge Bottom: Helps the box enter compatible soil during manufacturer-approved installation and positioning procedures.
• Approximately 1,344 lbs: Intended for handling with properly rated compact excavators, small excavators, and rubber-tired backhoes.
• Steel Alternative to Aluminum: Combines relatively manageable weight with durable welded-steel construction.
• Double-Wall Construction: Three-inch sidewalls are built for repeated use on demanding municipal, plumbing, and industrial maintenance projects.
• Solid-Welded Steel Design: Provides a durable structural assembly for regular field use.
• Cast Steel Spreader Collars: Provide durable attachment points for compatible Kundel Basic 3 spreaders.
• Forged Spreader Pins: Secure compatible spreaders within the collar system.
• Integrated Tamping Blocks: Provide reinforced contact areas for manufacturer-approved positioning procedures.
• Integrated Lifting Lugs: Provide designated lifting points for properly rated rigging and equipment.
• Modular Configuration: Compatible Basic 3 boxes may be stacked or connected in tandem when the complete arrangement is permitted by Kundel’s tabulated data.

Product Specifications

Pricing & Logistics

Price: $6,749.02

The listed price is for the Kundel Basic 3 7.5′ x 6′ trench box. Four compatible spreaders are required to assemble a complete box and are sold separately.

Contact Iron Lot to confirm current pricing, availability, compatible spreader lengths, stacking components, tandem connectors, optional accessories, applicable taxes, and freight charges.

Required Spreaders

Each Basic 3 trench box requires four compatible spreaders. The correct spreader length depends on the desired inside working width, excavation geometry, pipe or utility-component dimensions, equipment clearance, and the limitations established in Kundel’s current tabulated data.

Spreaders should not be assumed to be included in the listed trench-box price. Confirm the required spreader size, quantity, forged spreader pins, and complete assembled configuration before ordering.

Optional Accessories

Available Basic 3 accessories may include:

• Compatible spreaders
• 12″ x 12″ utility cutout
• Stacking rings
• Tandem connectors
• Replacement forged spreader pins
• Compatible rigging and handling equipment

Optional accessories must be selected for this specific box and its intended application. Confirm compatibility, pricing, and availability when requesting a quote.

Freight and Delivery Coordination

The trench box has a listed weight of approximately 1,344 lbs before adding spreaders, stacking rings, tandem connectors, rigging, or other accessories. The final assembled and shipping weight depends on the complete ordered configuration.

Transportation and unloading plans should account for the 90-inch panel height, component securement, lifting capacity, rigging arrangement, and available assembly space.

Iron Lot can coordinate delivery to a contractor yard, municipal facility, equipment location, or jobsite.

Target Applications

The Kundel Basic 3 7.5′ x 6′ is primarily suited to localized utility excavations where crews need substantial sidewall coverage and a moderate longitudinal work area.

Potential applications may include:

• Water and sewer service taps
• Utility spot repairs
• Service-line connections
• Valve and curb-stop access
• Utility tees, crosses, and localized fittings
• Localized utility exposure and maintenance
• Gas-service repairs and connections
• Electrical and telecommunications service work
• Plumbing repair excavations
• Industrial maintenance projects
• Emergency municipal utility repairs
• Work in streets, easements, and congested jobsites

The 6-foot overall length provides more working room than the 7.5′ x 4′ and 7.5′ x 5′ models. This additional space may be useful for compatible pipe, fittings, valves, service connections, tools, and crew movement.

Compared with the 7.5′ x 8′, 7.5′ x 10′, and 7.5′ x 12′ models, this box requires less longitudinal excavation and positioning space. That may make it easier to place around pavement limits, nearby structures, existing utilities, traffic-control restrictions, landscaping, and other jobsite obstacles.

This box should not be selected solely because its 7.5-foot height corresponds with the anticipated excavation depth. Suitability depends on the dimensions and locations of the pipe, fitting, valve, structure, utility component, tools, and equipment used inside the shield.

Customers should verify that the 60-inch length between spreaders and 27-inch pipe clearance provide adequate room for the intended work.

Standalone, Stacked & Tandem Configurations

The Basic 3 7.5′ x 6′ may be used as a standalone trench box where its dimensions, working clearances, depth ratings, and complete configuration are appropriate for the excavation.

Compatible Basic 3 boxes may also be stacked or connected in tandem when the arrangement is permitted by Kundel’s current tabulated data. Stacking can increase total vertical panel coverage, while tandem connections can create a longer shielded work area.

Stacked configurations must use compatible stacking rings or other manufacturer-approved connecting components. Tandem configurations must use approved tandem connectors.

The boxes, spreaders, connection points, structural capacities, panel lengths, and complete protective-system arrangement must all be compatible. Do not stack or connect boxes solely because their exterior dimensions appear similar.

Critical Selection & Safety Factors

Is the Kundel Basic 3 7.5′ x 6′ Right for Your Excavation?

The exterior height and length of a trench box do not by themselves determine whether it is suitable for a project.

The selection process should consider:

• Whether the box will be used independently, stacked, or in tandem
• Excavation depth, width, length, and geometry
• Available longitudinal working and placement space
• Soil classification
• Surcharge loads
• Groundwater and changing soil conditions
• Traffic, structures, spoil piles, and equipment near the excavation
• Pipe, fitting, valve, structure, and utility-component dimensions
• The 60-inch opening between spreaders
• Required longitudinal, vertical, and lateral working clearances
• Selected spreader length and resulting inside width
• Access and egress requirements
• Lifting, placement, and removal equipment
• Stacking rings, tandem connectors, and optional cutouts
• The complete protective-system configuration

The project’s Competent Person must inspect the excavation, classify the soil, evaluate changing conditions and adjacent hazards, and verify that the selected trench-protection system is appropriate for the excavation and used correctly.

Depth Ratings & Tabulated Data

The listed maximum soil depth ratings for the Basic 3 7.5′ x 6′ are:

• Type A soil: 58 feet
• Type B soil: 32 feet
• Type C soil: 24 feet

These ratings must be interpreted through Kundel’s current tabulated data. They do not mean that a 7.5-foot-high trench box automatically provides a shielded work area at the listed excavation depths.

The allowable depth may depend on the selected spreader width, complete system configuration, soil conditions, surcharge loads, groundwater, excavation geometry, box placement, stacking arrangement, and other jobsite factors.

The listed depth rating is not the same as the available shielded work-area height. Placement of the trench box relative to the excavation bottom and the top of the excavation must comply with Kundel’s instructions, current tabulated data, and applicable requirements.

Excavations exceeding 20 feet in depth generally require a protective system designed or approved under the applicable engineering requirements. Do not rely on product-page ratings as a substitute for Kundel’s current tabulated data or a project-specific engineered design when one is required.

Assembly, Lifting & Inspection

The Basic 3 trench box must be assembled with four compatible spreaders and the required forged spreader pins before use. Stacked or tandem configurations also require all approved connecting components.

The complete box should be lifted, lowered, repositioned, and removed using the designated lifting lugs, properly rated rigging, and equipment with sufficient capacity for the complete assembled weight.

The tall 90-inch panels require careful control during assembly, lifting, positioning, and removal. Tamping blocks provide reinforced contact areas, while the knife-edge bottom assists with positioning in compatible soil conditions.

All installation and positioning procedures must follow Kundel’s instructions. Do not strike unapproved areas of the sidewalls, spreader collars, lifting lugs, or other structural components.

Before each use, inspect:

• Double-wall steel sidewalls
• Knife-edge sections
• Cast steel spreader collars
• Spreaders and forged spreader pins
• Tamping blocks
• Lifting lugs
• Stacking rings and connection points
• Tandem connectors
• Welds and structural areas
• Optional utility cutouts
• All components for cracks, bends, distortion, damage, or excessive wear

Damaged or questionable components should be removed from service until they have been evaluated according to the manufacturer’s requirements.

Why Choose the Kundel Basic 3 7.5′ x 6′?

The Basic 3 7.5′ x 6′ combines substantial sidewall height, a manageable excavation footprint, useful working length, and durable welded-steel construction.

It is designed for crews that need a tall shield for localized utility work but do not require the excavation length of an 8-, 10-, or 12-foot trench box. The 6-foot length may provide a useful balance between restricted jobsite access and the working room needed for compatible utility components.

This can make the box a practical option for service taps, valves, fittings, utility connections, spot repairs, and industrial maintenance work in congested locations.

The double-wall steel sidewalls, cast steel spreader collars, forged pins, tamping blocks, lifting lugs, and knife-edge bottom provide a durable field-ready system for municipal, plumbing, industrial maintenance, and underground utility crews.

Final selection must be based on the actual excavation, intended application, pipe or utility-component dimensions, selected spreaders, complete system configuration, Kundel’s current tabulated data, and the requirements established by the project’s Competent Person.

Request Pricing and Availability

Iron Lot supplies trench boxes and trench safety equipment to contractors throughout the United States.

Contact us for:

• Current product availability
• Spreader selection and pricing
• Multiple-unit quotations
• Freight quote and delivery coordination
• Alternative aluminum trench box options
• Steel versus aluminum trench box comparisons
• Equipment financing information

This Product Ships from Ohio

Payment Options:

We accept company check, wire transfer, ACH, and credit card payments. We also offer financing through Ascentium Capital.

Financing: Ascentium Capital offers fast and flexible financing. With their quick and convenient way to purchase equipment, working with Ascentium Capital helps you acquire the funds you need for your equipment purchase. With financing and leasing of up to $2,000,000, Ascentium Capital works with you to make the application process simple and at no obligation.

To learn more about Ascentium Capital and how it can assist you, click image below:

Call Iron Lot at 336-516-8011 or request a quote online for current pricing, availability, and freight information.

Not sure which trench box is right for your project? Compare additional trench boxes for sale, including steel, aluminum, and manhole box options.