4′ x 6′ Kundel Basic 3 Steel Trench Box Stacker

The Kundel Basic 3 4′ x 6′ steel trench box is a durable stacker designed for municipal utility departments, plumbing contractors, industrial maintenance crews, and underground contractors using small excavators or rubber-tired backhoes.

This 4-foot-high model is primarily used as an extension section stacked on a compatible taller Basic 3 trench box. When permitted by Kundel’s current tabulated data, it may also be used as a standalone trench shield for localized excavations where its height, length, working clearances, and structural ratings are appropriate.

The 6-foot panel length provides more longitudinal working room than the 4′ x 4′ Basic 3 stacker while remaining manageable for utility taps, spot repairs, service connections, localized utility exposure, and maintenance work in restricted jobsites.

The box uses 3-inch double-wall, solid-welded steel sidewalls engineered to provide durable field performance without the weight associated with many larger conventional steel trench shields. Its listed weight of approximately 780 lbs makes it suitable for handling with properly rated small excavators, compact excavators, and rubber-tired backhoes.

Each Basic 3 trench box requires four compatible spreaders. Spreaders are sold separately, and the correct spreader size must be selected for the required inside working width and complete protective-system configuration.

Key Benefits & Crew Efficiency

• 4-Foot Stacker Height: Primarily designed to add vertical panel coverage to a compatible taller Kundel Basic 3 trench box.
• Standalone Capability: May be used independently for suitable localized excavations when allowed by Kundel’s applicable tabulated data.
• 6-Foot Panel Length: Provides additional working room compared with the 4′ x 4′ stacker without requiring the excavation footprint of a longer 8-, 10-, or 12-foot box.
• Approximately 780 lbs: Designed for handling with properly rated small excavators, compact excavators, and rubber-tired backhoes.
• Steel Alternative to Aluminum: Provides the durability of solid-welded steel in a relatively lightweight trench-box configuration.
• Double-Wall Construction: Three-inch sidewalls are built for repeated use on demanding municipal, plumbing, and industrial maintenance projects.
• Cast Steel Spreader Collars: Durable collars provide connection points for compatible Basic 3 spreaders.
• Forged Spreader Pins: Secure compatible spreaders within the box’s collar system.
• Integrated Tamping Blocks: Reinforced areas provide designated contact points for manufacturer-approved positioning procedures.
• Integrated Lifting Lugs: Provide designated lifting points for properly rated rigging and equipment.
• Stackable Configuration: Compatible stacking rings may be used to connect this stacker to an approved Basic 3 base box.
• Tandem Capability: Approved tandem connectors may allow compatible boxes to be connected for longer protected work areas.

Product Specifications

Pricing & Logistics

Price: $4,450.41

The listed price is for the Kundel Basic 3 4′ x 6′ trench box stacker. Four compatible spreaders are required to assemble a complete box and are sold separately.

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

Required Spreaders

Each Basic 3 trench box requires four compatible spreaders. The appropriate spreader length depends on the desired inside working width and the limitations established in Kundel’s current tabulated data.

Do not assume spreaders are included in the listed trench-box price. Confirm the required spreader size, quantity, forged pins, and complete system 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 the specific box and intended application. Confirm compatibility, pricing, and availability when requesting a quote.

Freight and Delivery Coordination

The stacker has a listed weight of approximately 780 lbs before adding spreaders, stacking rings, tandem connectors, rigging, or other accessories. The final shipping and handling weight depends on the complete ordered configuration.

Transportation planning should account for securement, unloading equipment, lifting capacity, and available assembly space.

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

Primary Stacker Application

The 4-foot-high Basic 3 model is primarily designed as a stacker. It can be connected to a compatible taller Basic 3 base box to increase the total vertical panel coverage of the protective system.

Stacked configurations must use the required Kundel stacking rings or other approved connecting components. The base box, stacker, selected spreaders, connecting hardware, and complete stacked arrangement must be compatible and permitted by the manufacturer’s applicable tabulated data.

The stacker should not be placed on another trench box solely because the exterior dimensions appear compatible. Product line, spreader-collar configuration, structural capacity, spreader arrangement, and approved connection method must all be verified.

Standalone Applications

When allowed by Kundel’s current tabulated data and approved by the project’s Competent Person, the 4′ x 6′ stacker may also be used as a standalone trench box for suitable localized work.

Potential standalone applications may include:

• Water and sewer service taps
• Utility spot repairs
• Service-line connections
• Valve and curb-stop access
• Localized utility exposure
• Plumbing repair work
• Industrial maintenance excavations
• Minor water-main and sewer-main repairs
• Electrical and telecommunications service work
• Work in streets, easements, and restricted-access areas

The 6-foot length provides more room than the 4′ x 4′ stacker for compatible pipe, fittings, valves, tools, and crew movement. It remains shorter than the 4′ x 8′, 4′ x 10′, and 4′ x 12′ Basic 3 models, making it easier to position where longitudinal excavation space is limited.

Suitability depends on the actual excavation and the dimensions and locations of the pipe, valve, fitting, service connection, utility component, tools, and equipment used within the box.

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

Tandem Configurations

Compatible Basic 3 boxes may be connected in tandem to create a longer protected work area when permitted by Kundel’s tabulated data.

Tandem configurations require approved connectors and a complete evaluation of both boxes, the selected spreaders, connection locations, excavation geometry, lifting plan, and manufacturer requirements.

Do not use improvised connections or assume that placing two trench boxes next to each other creates an approved tandem system.

Critical Selection & Safety Factors

Is the Kundel Basic 3 4′ 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 as a stacker or standalone shield
• Compatibility with the selected Basic 3 base box
• Excavation depth, width, length, and geometry
• Soil classification
• Surcharge loads
• Groundwater and changing soil conditions
• Traffic, structures, spoil piles, and equipment near the excavation
• Pipe, fitting, valve, and utility-component dimensions
• Required working clearance
• Selected spreader length and inside width
• Access and egress requirements
• Lifting and placement equipment
• Stacking rings, tandem connectors, and other accessories
• 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 4′ 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 4-foot-high stacker automatically provides a protected work area at the listed excavation depths.

The allowable depth may depend on whether the box is used independently or in a stacked configuration, the selected spreader width, complete system height, soil conditions, surcharge loads, excavation geometry, and other jobsite factors.

Placement of the protective system, including the distance between the bottom of the box and the excavation bottom and the position of the box relative to the top of the excavation, must comply with manufacturer instructions 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 stacker must be assembled with four compatible spreaders and the required forged spreader pins before standalone 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, approved rigging, and equipment with sufficient rated capacity.

Tamping blocks provide reinforced contact areas, but positioning and installation must follow Kundel’s procedures. Do not strike unapproved areas of the sidewalls, spreader collars, or other structural components.

Before each use, inspect:

• Double-wall steel sidewalls
• 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
• 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 4′ x 6′?

The Basic 3 4′ x 6′ combines a manageable excavation footprint, relatively low listed weight, and durable welded-steel construction. It is designed for contractors and public works departments that need a dependable steel shield for small equipment and localized utility work.

As a stacker, it can increase the vertical coverage of a compatible taller Basic 3 trench box. As a standalone shield, it may provide a practical option for utility taps, service connections, spot repairs, and maintenance excavations where its dimensions and clearances are appropriate.

The 6-foot length provides a useful middle ground between the shorter 4′ x 4′ stacker and longer Basic 3 configurations. It offers additional working room while remaining practical for streets, easements, industrial facilities, and other jobsites with restricted access.

The double-wall steel construction, cast steel spreader collars, forged pins, lifting lugs, and tamping blocks are intended to provide a durable, field-ready system for municipal, plumbing, and industrial maintenance crews.

Final selection must be based on the actual excavation, intended application, utility-component dimensions, complete stacking or standalone 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.