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The next generation in chamber access systems, STAKKAbox™ ULTIMA Connect is a modular scalable solution built on-site with easily connectable components which significantly reduce costs of in-situ construction through time saving.

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Features & Benefits

Variability in Size

ULTIMA Connect offers a huge range of chamber dimensions thanks to the large number of standard sections and the variability offered by the ULTIMA Connect system.


Due to the sectional twinwall design and the GRP material, most ULTIMA Connect 150mm deep sections fall under 25kg in weight, making them suitable for a single person lift under manual handling regulations.

Flat Pack Option

STAKKAbox™ ULTIMA Connect can be shipped ‘flat packed’ to reduce shipping costs. A large chamber, as used on power stations or waste water treatment works, could be reduced to a number of pallets rather than occupying an entire truck.

Fast and Easy to Install

ULTIMA Connect 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. Only the largest sizes in the range require specialist equipment or plant in order to install the chamber.

Flexibility in Construction

Duct entries can be quickly and safely formed on site. Overbuilding or benching is easily achieved. Fine top level adjustment is possible by horizontally cutting the top section.


ULTIMA Connect offers the ability to offset joints between sections to provide a strong brickwork effect improving side wall performance.

Chemical Resistance

GRP outperforms traditional construction methods for chemical resistance during its buried life, resulting in a product that offers longer installed life.

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.

Modular & Scalable

Cubis have manufactured large bespoke chambers for a number of high-profile construction projects including power stations, sports stadiums and city centre redevelopments.

The chambers can be utilised to accommodate high voltage joints and turns, large water valves or any other utility enclosure. Each chamber is fast and easy to install, flexible to adapt in production and on site and will have a much longer life than chambers installed using traditional methods.

Stakkabox ULTIMA Connect Modular Content Modular And Scalable



Glass Reinforced Polyester Resin (GRP), is a composite material, made of a polyester resin reinforced with glass fibres.


Available Sizes

Information on sizing

ULTIMA Connect clear opening sizes are created by combining the corner pieces. This can include one or more sidewall pieces to offer a greater number of sizes.

The corner pieces are referred to by the internal length on the long side. This dimension will be 80mm shorter than the stated length as this is made up in the short length of the ‘corner piece’.

Download our product size guide for chambers in order to gain more information on available sizes.


Load Rating

STAKKAbox™ ULTIMA Connect is suitable for installation in environments rated to F900 under EN124.

Suitable for areas imposing high wheel loads, e.g. docks, aircraft pavements.


Options & Accessories

STAKKAbox™ ULTIMA Connect can be supplied with the following accessories: