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QUAD (Product)
QUAD (Product)
QUAD (Photo) (2)
QUAD (Photo) (1).JPG

STAKKAbox™ Quadbox is a range of modular and structural preformed access chambers, supplied by Cubis. Available in the 102, 104 and 106 sizes, Quadbox is the only modular access chamber approved for use on Openreach networks.

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

Using the Quadbox system, complete chambers can be constructed from excavation to reinstatement in little more than one hour.

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  • Fast and easy to install
    STAKKAbox™ chambers 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 chamber and there is no need for specialist box builders. 
  • Sectional & twin wall design
    Chambers 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 chamber possesses vertical and horizontal ribs,  resulting in a product that is strong vertically and on the sidewall. Quad does not require specialist backfills, reducing installation costs.
  • All weather construction
    Unlike with brick-built chambers where freezing temperatures can stop work, Quad can be installed in all types of weather.
  • Smooth outer walls with lip to ‘key in’
    Gaps in the outer wall will negatively impact the effectiveness of compaction around the chamber. STAKKAbox™ chambers have smooth outer walls and an outer lip which keys into the backfill.
  • Flexible during installation
    Chambers can be adapted to suit on-site conditions with standard tools
    • Overbuild over existing networks
    • Introduce duct entries for cable entry. Recommended spacing, in line with BT Quality checks, is indicated on the chamber. 
  • Drop-in furniture and steps
    Cable management and steps are fitted by dropping the accessories into pre-formed pockets. These allow accessories to be retrofitted after installation without mechanical fixing.
  • Meets requirements for Openreach quality checklist
    Openreach checks all chambers against 13 step Quality Checklist for its brick, concrete and Quad joint boxes. When using Quad, this checklist is reduced to 8 checks.

STAKKAbox™ Quad  is commonly used for the following applications:


  • Suitable for use for jointing boxes for Openreach or other telecommunication networks

STAKKAbox™ Quad is suitable for installation in environments rated to B125 under EN124, in accordance with Cubis' installation guidelines.

For further information on STAKKAbox Quad installation, please visit

STAKKAbox™ Quad is manufactured in High Density Polyethylene.

Benefits of HDPE:

  • Fully recyclable
  • Robust
  • Impervious to water
  • High strength to weight ratio
  • High stiffness to weight ratio

STAKKAbox™ Quad features drop-in chamber furniture, which allows  fitting after the chamber has been installed.

Drop-in Wall Bracket

Drop in wall-bracket, manufactured in galvanised steel.  Also required:


Drop-in step

Drop-in step which locates in the corners. Required for any chamber over 600mm deep.



Which accessories do I require?

BT Reference Drop-in Wall Bracket & Bearers Drop-in Step
JMF 102  
JMF 104
JMF 106
BT Reference Clear Opening Depth per section Section Weight Typical chamber depth*
JMF 102 725mm x 225mm 150mm 7kg 600mm
JMF 104 915mm x 445mm 150mm 14kg 750mm
JMF 106 1310mm x 610mm 150mm 19kg 750mm

*Depths should be specified by Openreach planner

All chambers are available with B125 access covers: Concrete Infill & Recessed.

Download our product size guide for more information on available sizes.

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Related Case Studies

SAM 3279 Conductive Concrete Install, Lurgan - Openreach

Conductive Concrete install as part of BT's Openreach NGA (Next Generation Access) project being rolled out to enhance fibre networks across the UK.

P1020359.JPG Training Day: Conductive Concrete Retrospective Install, Openreach

A retrospective installation demo of Cubis SAN-EARTH Conductive Concrete as part of BT's Openreach NGA (Next Generation Access) project.