Hydrant Access Chamber

Hydrant Access Chamber

Access Chambers

Hydrant is a range of modular and structural preformed Access Chamber Systems from the STAKKABOX range of access chambers. Developed specifically for the water market, the STAKKAbox™ Hydrant System, manufactured by Cubis, is ideal for housing hydrant valves, air & sluice valves, meters or wash out chambers.

The Hydrant system offers an effective replacement to the more traditional concrete sectional chambers.  It is a good, low weight alternative to concrete and brick chambers.

How do access chambers work? The STAKKAbox Hydrant Water System is available in two clear opening sizes: 380mm x 230mm and 600mm x 450mm (25mm and 75mm section depths) and can be complemented with the versatile STAKKAbox MODULA system to provide other larger sizes for water applications in 150mm depths.

Each chamber section locks with the section above and below it, which provides exceptional sidewall stiffness. The sections are easy for one person to lift but is still capable of supporting a minimum of 40 tonnes vertical loading. 

Installation of Cubis STAKKAbox Hydrant

Installation of Cubis STAKKAbox Hydrant

STAKKAbox Hydrant

hydrant ACCess chamber

Features & Benefits

quick & easy assembly

Cubis STAKKAbox™ access chambers are much quicker to install than conventional alternatives, with complete installations taking typically less than one hour, resulting in a reduction in labour costs. The access chambers can be adapted easily to suit unique on-site conditions using only standard tools to overbuild over existing networks, introduce duct entries for cable entry and for top-section fine adjustment.

Smooth Outer Walls

The Hydrant features smooth outer walls with an outer lip which keys into the backfill.  Any gaps in the outer wall could negatively impact on the effectiveness of compaction around the chamber. Can be supplied with D400 surface box or B125 Concrete Infill access cover.

Sectional Twin Wall Design

Access chambers are built to required depth by adding 25mm or 75mm stackable sections. Due to the twinwall design, individual sections are light meaning that entire chambers can be manually lifted. Each access chamber possesses vertical and horizontal ribs,  resulting in a product that is strong vertically and on the sidewall.

robust recycled materials

Specifying STAKKAbox™ Hydrant helps users to reach sustainability targets due to the material being largely composed of high-grade recycled material. Cubis Hydrant is also completely recyclable at the end of its life. The robust recycled material means no breakages and therefore no lost product when in use and in transit.



STAKKAbox Hydrant

How The hydrant Access chamber Works

As part of Cubis’ STAKKAbox™ range of preformed access chambers, the Hydrant system is easy for one person to lift and is strong enough to support a minimum of 40 tonnes vertical loading.

Each chamber section locks with the section above and below it, which provides exceptional sidewall stiffness.

The STAKKAbox™ chamber can be installed easily in less than 20 minutes, meaning footways and roads can be re-opened quickly.

➡ See also | Access Covers | Cable Protection | Cable Trough


STAKKAbox Hydrant



The STAKKAbox™ Hydrant system is moulded in talc-filled recycled Polypropylene (PP) which possesses excellent strength to weight properties.

Each section is ribbed internally to improve loading performance.

STAKKAbox Hydrant


Access Chamber Sizes

STAKKAbox™ Hydrant chambers are formed by combining interconnecting ring sections with either a 25mm or 75mm profile in order to achieve the correct depth.

Hydrant is available in two clear opening sizes and can be fitted with an LDPE base in a number of options.

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



STAKKAbox Hydrant

Load Rating

STAKKAbox™ Hydrant is suitable for installation in environments rated to D400 under EN124.

Suitable for carriageways of roads and areas open to commercial vehicles.




Access Chamber Hydrant

Technical Specification

Hydrant Size


Product Code

380x230x25 1.2 kg CPQUQ2-07250255-00000000
380x230x75 2.3 kg CPMHRS-03800230-0075
600x450x25 1.9 kg CPMHRS-06000450-0025
600x450x75 3.7 kg CPMHRS-06000450-0075

For additional data sheets contact Thorne & Derrick, or visit Cubis’ technical library here

Thorne & Derrick are also distributors of Filoform duct sealing products.

Protection of Cables Against Water Ingress (Flood), Gas Migration (Explosion) & Fire – see duct sealing systems for further information