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Modula In Ground
Modula In Earth

STAKKAbox™ Modula is a range of modular and structural preformed access cable pits, suitable for use across across all major industry sectors (in accordance with CUBIS’ installation guidelines). 

The system provides contractors with a means of constructing access pits quickly and inexpensively, whilst offering improved build quality, reduced defects and enhanced site safety performance.

The Modula system is moulded in PP and possesses excellent strength to weight properties. Each section is ribbed internally to improve loading performance. 

Using the Modula system, complete cable pits can be constructed from excavation to reinstatement in less than one hour.

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  • Fast and easy to install
    STAKKAbox™ pits are significantly faster to install than conventional alternatives, with complete installations typically taking up to one hour. This results in reduced costs for the installer. No specialist equipment or plant is required in order to install the access pit and there is no need for specialist pit builders. 
  • Sectional & twin wall design
    Pits are built to required depth by adding 150mm sections. Due to the twinwall design, individual sections are light meaning they can be manually lifted. Each access pit possesses vertical and horizontal ribs,  resulting in a product that is strong vertically and on the sidewall. Most installations do not require specialist backfills, reducing installation costs.
  • Manufactured from recycled material
    Specifying STAKKAbox™ Modula helps end users reach sustainability targets due to the material being largely composed of high-grade recycled material. In addition, Modula is completely recyclable at the end of its life.
  • Flexible during installation
    All pits can be adapted to suit on-site conditions with standard tools
    • Overbuild over existing networks
    • Introduce duct entries for cable entry. 
  • Smooth outer walls with lip to ‘key in’
    Gaps in the outer wall will negatively impact the effectiveness of compaction around the access pits. STAKKAbox™ pits have smooth outer walls and an outer lip which keys into the backfill.
  • Flat pack option
    MODULA pits can be supplied in 'flat pack' format to make shipping more efficient.
  • Variability in size
    STAKKAbox™ MODULA can be used to create a large number of sizes due to its component design. This provides access pits with clear opening from 150 x 150 up to 1200 x 1200. Ring sections are built by combining corners (which provide 75mm or 150mm to the sidewall length) and sidewall pieces. Sidewall pieces measure 100mm, 150mm, 300mm, 375mm, 450mm and 600mm.
  • Manufactured from recycled material
    Specifying STAKKAbox™ Modula helps end users reach sustainability targets due to the material being largely composed of high-grade recycled material. In addition, Modula is completely recyclable at the end of its life.

STAKKAbox™ Modula is commonly used for the following applications:


  • Motorway Communications ('B', 'C' & 'Loop' sizes)
  • Traffic Signalling and Street Lighting


Rail (outside UK)

  • Station Platforms



  • Jointing cable pits (Telstra, NBN, local networks)



  • Valve pits
  • Telemetry pits



  • Link cable pits

STAKKAbox™ Modula is suitable for installation in environments rated to D400 under EN124, in accordance with CUBIS' Installation Guidelines.

STAKKAbox™ Modula is manufactured in talc-filled recycled Polypropylene.

Benefits of Polypropylene:

  • Excellent chemical resistance to ethanol, acetone, diesel etc.
  • Unaffected by sulfate ground conditions.
  • Recyclable
  • Low moisture absorption
  • Robust - no breakage waste
  • High strength to weight ratio
  • High stiffness to weight ratio
  • Easy to cut for duct entries

Pit Accessories

Access pits can be pre-fitted with the following accessories:

  • Duct Entry
  • Cable Management
  • Steps

For more information, please visit the access pit accessories page.

Base sections

Standard Base

Access pits can be supplied with a base section, manufactured in LDPE. These are securely fitted to a ring section or bottom of a pit to provide a clean easy finish to the floor of the access pit. There is no requirement to 'float' a floor on site and the floor prevents vegetation and silt from entering.

Modula offers a wide range of pit sizes, please contact the Cubis Systems team to discuss your project requirements.

Modula Profiles

Modula is available in two types of profile: Solid Ring and Component.

Solid Ring Component Ring



 Commonly requested sizes in a single moulded ring. 

Sections built from combining corner pieces and sidewall pieces to provide a wide number of clear opening sizes.  Parts are connected using a connector piece. 

Corners: 75mm, 150mm (each direction)
Sidewall pieces: 
100mm, 150mm, 300mm, 375mm, 450mm, 600mm

Commonly requested sizes

Clear Opening Profile External Depth
300mm x 300mm Component 394mm x 394mm 155mm
450mm x 300mm Solid Ring 544mm x 394mm 155mm
450mm x 450mm Solid Ring 544mm x 544mm 155mm
600mm x 450mm Solid Ring 694mm x 544mm 155mm
600mm x 600mm Solid Ring 694mm x 694mm 155mm
750mm x 600mm Component 844mm x 694mm 155mm
750mm x 750mm Component 844mm x 844mm 155mm
900mm x 600mm Component 994mm x 694mm 155mm
900mm x 900mm Component 994mm x 994mm 155mm
1200mm x 600mm Component 1294mm x 694mm 155mm
1200mm x 900mm Component 1294mm x 994mm 155mm
1200mm x 1200mm Component 1294mm x 1294mm 155mm

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Related Case Studies

091 - Worcester CC - MULTIduct Crossing - UK - 013 (1).JPG Worchester City Council Under Road Crossing: MULTIduct™

Worcester City Council under-road crossing installation using MULTIduct™ cable trough, MODULA chamber and AX-S™ Composite cover.