Quad Access Chamber

Quad Access Chamber | Cubis STAKKAbox

Access Chambers | Cubis STAKKAbox

Quad is a range of modular and structural preformed Access Chamber Systems from the STAKKABOX range of access chambers. The Quad Access Chamber offers a modern alternative to traditional brick built chambers provides contractors with a means of constructing access chambers safely, quickly and inexpensively.

STAKKAbox™ Quad manufactured by Cubis, is the only modular access chamber approved for use on Openreach networks.

How do access chambers work? STAKKAbox™ Quad comprises of sections, 150 mm deep, stacked to the specified height on top of a concrete or Type 1 base. They are available in three sizes – 102, 104 and 106.

Installation of Cubis' Quad Access Chamber

Installation of Cubis’ Quad Access Chamber

STAKKAbox QuadQuad Access Chamber

quad ACCess chamber

Features & Benefits

quick & easy assembly

STAKKAbox™ access chambers are significantly faster to install than conventional alternatives, with complete installations typically taking less than one hour, resulting in reduced labour costs. No specialist equipment or plant is required in order to install the chamber and there is no need for specialist box builders.

Drop-in accessories

Cable management and steps are fitted by dropping the accessories into pre-formed pockets which allow accessories to be retrofitted after installation without requiring any mechanical fixing. Where required, ring sections can be cut to bridge over or around existing networks or obstacles. Duct entries can be cut as and where required using a hole saw mounted on a cordless drill. The chambers incorporate guides which identify drilling points to ensure correct duct spacing.

all weather construction

Unlike brick chambers where freezing temperatures can stop work, Quad can be installed in all types of weather. The traditional brick built access chambers often produce variable build quality standards resulting in frequent rejection by Openreach inspectors. The use of STAKKAbox™ Quad eliminates this issue to offer a consistent installation every time.

integrated systems

Access chambers are built to the required depth by adding 150 mm sections. Each ring section is castellated to positively interlock with the unit above and below. Cover options and accessories can then be added to complete the system. Each section weighs under 25kg, making  it suitable for a single person to lift under manual handling guidelines. Quad can be used to retrofit chambers over a pre-existing network or to replace chambers that have been damaged or need to be enlarged.


A base can be constructed from: 50mm of dry mix concrete on 100mm of compacted Type 1; 150mm of compacted Type 1; 150mm deep concrete base (C20 or dry mix) or 50mm of ready mix concrete on 100mm of compacted Type 1.

Covers are available as Concrete Infill (B125) & Recessed (B125) and there is an option to fit a sub-security plate for added security.


Quad Access Chamber

How The quad Access chamber Works


STAKKAbox™ Quad comprises of lightweight 150mm deep sections which are stacked on top of a concrete or Type 1 base to build the chamber to the desired depth.

There is no requirement for a lifting plant or skilled box builders when building these chambers and where required, the rings may be cut to bridge over or around any existing networks or obstacles.

See also | Access Covers | Cable Protection | Cable Trough


Access Chamber

Chamber Materials

HDPE Access Chambers

Cubis’ STAKKAbox™ Quad access chamber is manufactured in nitrogen-foamed High Density Polyethylene (HDPE), of which up to 70% is recycled material.

HDPE possesses excellent strength to weight properties.

Access Chambers


Access Chamber Sizes

STAKKAbox™ Quad is the only modular access chamber approved for use on Openreach networks.

They are available in three sizes; 102, 104 and 106.

All chambers are available with B125 access covers and Cubis’ range of chamber accessories.

View the product size guide for more information on available sizes.



Quad Access Chamber

Load Rating

STAKKAbox™ Quad is suitable for installations in areas rated C250 under BS: EN124: 1994.

Quad is only approved for Openreach installations in pedestrian areas that are rated B125.




Access Chamber

Technical Specification



Product Code

725 x 255 6.7 kg CPQUQ2-07250255-00000000
915 x 445 13.7 kg CPQUQ2-09150445-00000000
1310 x 610 18.8 kg CPQUQ2-13100610-00000000

For additional data sheets contact Thorne & Derrick

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Protection of Cables Against Water Ingress (Flood), Gas Migration (Explosion) & Fire 

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Cable Protection

Cable Ducting | Cable Troughing | Pulling & Laying | Sealing LV MV HV Cables

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Data Sheets