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The ULTIMA Hybrid utilises the inherent benefits of the STAKKAbox™ ULTIMA Connect system, providing amplified Class D strength capabilities without compromising on ease of installation.

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Features & Benefits

Fast and Easy to Install

STAKKAbox™ access pits are significantly faster to install than conventional alternatives, providing substantial cost reductions for the installer. The modular assembly solution incorporates the ULTIMA Connect pit system, engineered ULTIMA beams and an interconnecting precast concrete base slab and encasement for rapid installation.

Smooth Outer Walls with Lip to ‘Key In’

Gaps in the outer wall will negatively impact the effectiveness of compaction around the access pit. STAKKAbox™ pits have smooth outer walls and an outer lip which keys into the backfill. Each ULTIMA Connect ring section is supported by ULTIMA beams which ensure all pieces are flush and no movement occurs once assembled.

Flat Pack Option

STAKKAbox™ ULTIMA Hybrid systems can be sent to site in a ‘flat pack’ arrangement, allowing for flexibility in delivery and installation. A large pit system can be reduced to a number of pallets rather than occupying an entire truck, thereby reducing total freight costs.

Sectional & Twin Wall Design

ULTIMA Hybrid pits are built to required depth by adding 150mm sections. Due to the twin wall design, individual sections are lightweight, meaning they can be easily lifted manually on site. Each access pit possesses vertical and horizontal ribs, resulting in a product that is strong vertically and on the sidewall.

Amplified Strength Capabilities

The entire ULTIMA Hybrid assembly, including the ULTIMA beams, precast base slab and encasement, acts as an exoskeleton achieving Class D load capacity certified to AS 3996. No specialist bracing, backfilling or concrete surround are required.

Superior Solution

ULTIMA provides a superior solution to conventional methods, such as in situ concrete, providing a rapid and flexible build over existing infrastructure or benching. Fine top-level adjustment is possible by horizontally cutting the top section or using structural packers up to 20mm.

Variability in Size

STAKKAbox™ ULTIMA Hybrid can be used to construct virtually any conceivable access pit clear opening. ULTIMA offers a huge range of pit dimensions thanks to the large number of standard sections and variability offered by the ULTIMA Connect system. With the enhanced strength capabilities provided by the ULTIMA beams, the Hybrid can withstand the most demanding of environments.

Flexibility in Construction

ULTIMA Hybrid pit systems offer a wide variety of wall section lengths, enabling customisation of pit width, length and depth to suit installation requirements. Duct entries can be quickly and safely formed on site with standard hand or power tools.

How It Works

The ULTIMA Hybrid utilises the ULTIMA Connect system with the added feature of ULTIMA beams specifically developed for large scale access pits of 2 metres in length and above. Manufactured to a variety of sizes, the ULTIMA beams provide enhanced lateral strength with a maximum beam length of 2.2 metres.

Hybrid 730 x 410 no background


Highly engineered, the entire ULTIMA Hybrid assembly acts as an exoskeleton to withstand the harshest of installation environments without the requirement for specialist bracing, backfilling or concrete surround.

ULTIMA Hybrid Beams Isometric



Glass-reinforced plastic (GRP), is a composite material, fibre-reinforced polymer made of a plastic reinforced by fine fibres made of glass. GRP has a high strength to weight ratio, high temperature range, high mechanical properties and is fire retardant. Additionally, GRP is also chemically inert and isn’t susceptible to creep.


Available Sizes

Sizing Information

STAKKAbox™ ULTIMA can be used to create virtually any conceivable access pit clear opening. ULTIMA offers a wide range of pit dimensions owing to the large number of standard sections and variability offered by the ULTIMA Connect system.

ULTIMA access pit sizes have been selected to be reflective of the most commonly used traditional access pit sizes. This makes ULTIMA an ideal retrofit solution for existing networks, minimising site disruption and installation costs.

For further sizing information contact the Cubis Specialist Team on 1800 065 356.

Connect Lengths730x410

Load Rating

STAKKAbox™ ULTIMA Hybrid is suitable for installation in environments rated to Class D load rating (ultimate limit state design of 240kN) under the Australian Standard AS/NZ 3996.

This makes the STAKKAbox™ ULTIMA Hybrid system suitable for major roads including freeway and motorway shoulders, as well as warehouses and loading docks.


Options & Accessories

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