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Manhole covers

Manhole covers are safety critical. With this in mind we develop solutions which incorporate features that help eliminate failure mechanisms, minimising safety issues and optimising whole life cost.

Unite manhole cover being installed

Our manhole cover ranges

Manufactured from heavy duty ductile iron, offering durable strength and long standing performance. Our extensive ranges include single, double and triple rectangular covers and round and square to round manhole covers, including popular and less common sizes. Available in load classes from A15 to E600. Our products are certified by BSI to BS EN 124, we also have ranges conforming to CD 534, as well as many other industry specifications. All our ductile ironwork carries the Kitemark, meaning our products offer a trusted solution.

Class beating manhole covers

Class beating performance, value and quality too.

supplier of ductile iron castings.
UK's No.1
recorded of Unite manhole covers.
0failures
castings covers sold every year.
>300,000
Minimise bedding pressure

Built on solid foundations

Foundation erosion is a common problem when weight and vibrations are transferred through access covers with a small frame flange area (footprint). In these situations every time traffic passes it sends small shocks through the installation to the underlying foundation, this can begin to wear down the foundation and potentially result it a failure.

All Wrekin D400 and E600 manhole covers include enlarged frame corners and increased overall flange areas to overcome this issue.

This design feature helps to dissipate the load in the foundations. By spreading the load, we minimise the stress on the frame. The result is less movement of the manhole cover and a longer life for the installation.

Meeting the needs of National Highways CD 534

National Highways has updated CD 534, a significant set of its requirements for manhole covers and gully grates installed on their road network. First released in February 2020 and updated to version 0.1.0 as of May 2022.

All Highway and Unite access covers meet the requirements of CD 534 v0.1.0

Frame flange area

CD 534 now sets a minimum flange area of 190,000mm² for D400 and 285,000mm² for E600 covers, this equates to 2.1N/mm² as in HA 104/09.

Frame depth and weight

A 150mm frame depth is now required on motorways and all purpose trunk roads. A lower limit frame weight is also specified to ensure frames are stiff enough.

Skid resistance

The WRc test mehod is now the only accepted test method for calculating skid resistance on raised chequer. This test measures a small tyre’s resistance to sideways slip caused by the cover surface.

D400 or E600

E600 manhole covers are to be installed in place of D400 covers where the Annual Average Daily Traffic (AADT) of light goods vehicles travelled on a road is greater than 1,500 in each direction.

Check road traffic statistics for AADT
Comparison list

Comparing Highway, Tristar and Unite

  Tristar Highway Unite
CD 534 v0.1.0 compliant
BSI Kitemarked to BS EN 124:2015
Safety keyway
Ensures lifting keys are held captive in the keyway during the lifting process, prevent accidental drops 
BS 7903 flange gussets
Increases frame rigidity and reduces vibration transfer, extending the life of the installation
Low wear seats
The cover and frame are designed to reduce seating wear, increasing installation life
Screwlift compatible
Compatible with our Screwlift height adjustment system
Gritblocker compatible
Keyway insert that prevents the keyway from becoming blocked with dirt and debris (included as standard on all Unite products)
Asset identification badge
A location on the cover is available to retrofit an identification badge
Simple and safe frame manoeuvring
The frame has lifting key points to enable simple and safe manoeuvring on site
Flood and odour control (factory fitted)
A flood and odour control plate can be factory fitted on request
Hinged rectangular covers in range
Hinge and lift out (Halohinge) covers, allowing cover to hinge to 100° and be secured in place, but also lifted out with standard lifting keys from a closed position
Retrofittable seal plate (to leakage class 1, 2 or 3)
Simple to install on site and can be drilled to provide low leak performance
Anti-flex covers
The covers are designed to reduce flex, providing a more robust and longer lasting installation.

Mortar sympathetic frame features
The frame is designed to bond with mortar to provide a more secure installation with reduced movement

Manhole cover frame raising system

ClickLift™

ClickLift eliminates the time and resources required to dig out and reinstall frames to suit the final adoptable surface. This eliminates the potential damage to manhole covers during construction and removes the potential for residents claims for damage to their vehicles and massively reduces disruption. ClickLift provides housing developers with huge savings in terms of time, money and hassle. Allowing whole estates to have their covers raised to the final surfacing level, in as little as a few hours.

The hard hat for your ironwork

Armadillo

Armadillo is a complete range of protector shells, designed to be placed over manhole covers and gully grates to provide enhanced protection during the construction phase.

Armadillo provides protection from construction site traffic, including tracked vehicles, and can be easily removed when the final surfacing is completed. This ensures manhole covers and gully grates can start their service life in ‘as new’ condition to optimise longevity.

Bespoke covers

Alongside our standard manhole cover ranges, we also offer bespoke designs. We have been lucky enough to work on amazing projects such as the iconic LGBTQ+ access cover with Thames Water, and commemorative covers for Abbey Road and the Whitechapel fatberg amongst others.

Whether you are looking to subtly to disguise your access cover, or something extravagant to shine proud and celebrate, we are able to help design and manufacture the perfect solution for you.

Related case study

M60 - M62 Smart Motorway

The M60 – M62 smart motorway forms an important part of the main east-west transport corridor, linking Merseyside and Greater Manchester with Yorkshire and the Humber. Wrekin Products worked closely with Manchester Smart Motorway JV, offering technical advice and adapting the specification of the product to ensure it would provide the optimum solution. 
Manchester Smart Motorway JV
Read the full Case Study
Case study

Solving Virgin Medias Failing Manhole Cover Issue

Virgin Media were experiencing serious problems with a manhole cover situated in a bus lane on Essex Road in Islington. Complaints from local residents and business owners were escalating and relationships with the local authority were becoming strained. Wrekin Products proposed the use of their Unite™ manhole cover and frame together with the UniPak™ bedding system.

Virgin Media
Virgin Media
Read the full Case Study