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MONObox™ POLYvault™

POLYvault™ is a modular design suitable for footway installations but is equally suited alongside rail tracks. The single wall design means the product remains very light even though it is a single piece construction.

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Features & Benefits

All Weather Construction

Unlike with brick-built chambers where freezing temperatures can stop work, POLYvault™ can be installed in all types of weather.

High Strength to Weight Ratio

The material is significantly lighter than other conventional materials that can provide the same inherent strength.

Structural Ribs

Each access chamber possesses vertical and horizontal ribs, resulting in a product that is strong vertically and on the sidewall.

Single Wall Design

Due to the Single wall design, individual sections are light meaning they can be manually lifted.

Flexible During Installation

Chambers can be adapted to suit on-site conditions with standard tools to overbuild over existing networks, Introduce duct entries for cable entry and for top-section fine adjustment.

Drop-In Covers

Covers are ‘dropped’ in the inner-lip of the chamber and do not require a frame.

Fast and Easy to Install

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.



MONObox™ POLYvault™ is manufactured in nitrogen-foamed High Density Polyethylene (HDPE), of which up to 70% is recycled material.

HDPE possesses excellent strength to weight properties.

POLYvault™ Base 730 x 410

Available Sizes

Information on sizing

MONObox™ POLYvault™ offers an extensive range of approved and manufactured chambers available in a selection of depths and clear openings. The system ranges from 470mm clear openings to 2440mm in size.  A range of Concrete Infill and Composite covers are available to compliment and complete the system.

POLYvault™ side 730 x 410

Load Rating

MONObox™ POLYvault™ is suitable for installation in environments rated to B125 under EN124.

Suitable for footways, pedestrian areas and comparable areas, car parks or parking decks.

POLYvault™ Front 730 x 410

Product Resources

Options & Accessories

MONObox™ POLYvault™ can be supplied with the following accessories: