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CD 534: Chamber Tops and Gully Tops for Road Drainage and Services, now at version 0.2.0. is here Find out more

A solution for every scenario

Highway D400 manhole covers

Designed and manufactured to meet the enhanced requirements of Highways England’s CD 534 v0.2.0 specification. The Kitemarked Highway range of manhole covers exceeds BS EN 124:2015 requirements and includes safety and specific design features required by Highways England.

Highway D400 double triangular manhole cover

Features

  • Independently tested by a UKAS-accredited laboratory to achieve a PSRV value of 70+ on the chequer surface.

    PSRV tested
  • Indexed corners ensure correct orientation and alignment first time, every time.

    Indexed corners
  • Enlarged corners spread loads evenly across the foundation, enhancing reliability and lifespan.

    Enlarged frame corners
  • Safety keyways are configured to support engagement of lifting keys during handling and lifting operations.

    Safety keyway
  • Built-in lifting points allow mechanical lifting, reducing manual handling and improving on-site safety.

    Mechanical lifting point
  • Optional ID badge supports RFID, NFC and IoT connectivity for asset identification and tracking.

    Retrofittable badge
  • Complies with CD 534 v0.2.0.

    CD 534 v0.2.0 logo

Hinge and Lift Out (HALO)

HaloHinge boasts a creative design. The covers are fully removable using standard BS 7903 lifting keys, but the covers can also hinge to 100 degrees, remaining captive within the frame and free from risk of accidental closure.

The hinges are located on the inside of the frame. This simple design allows for the infill surfaces to be compacted against the straight edges of the frame with ease, unlike other alternatives that have protruding hinges that are difficult to compact around. Compacting equipment over the hinge housing can apply destructive forces to the hinge housing and foundation, making inboard hinges a great solution.

Moreover, the inboard hinges prevent hinge pockets from clogging with dirt and debris, ensuring that the hinges operate reliably and promote better health and safety. Additionally, Highway HaloHinge covers are compatible with GritBlocker, the anti-blockage keyway insert that provides unblocked keyways at every operation.

Find a product

loading

Should I upgrade to an E600 cover?

There are several advantages, and reasons driven by standards, to increase the load classification of an access cover from D400 to E600, including:

Increased frame bedding area

E600 covers feature an increased frame bedding area, which results in a reduction in bedding stresses during trafficking, increasing the longevity of the product and its installation.

Increased resistance to unintended traffic

E600 products are more likely to withstand unintended traffic loads e.g. pre-service loads as commonly found on construction sites which can result in damage to installed ironwork.

AADT >1,500?

National Highways CD 534 stipulates where the Annual Average Daily Traffic (AADT) of light goods vehicles travelled on a road is greater than 1,500 in each direction, an E600 cover must be installed. Most A roads will have an AADT above this.

Read more about CD 534
Dark night road with lights showing cars traveling
Create an installation that lasts

Specification clauses

Download and use our specification clauses within project documentation to reference Unite and Highway product ranges for ironwork installations. These documents provide clear guidance to support specification and product selection during project planning.

Incorporating these clauses within specifications helps provide consistency in product selection and installation approach across projects involving ductile iron access covers and frames.

Retrofittable identification bolt being installed in a Unite access cover
Only with Wrekin

Retrofittable antenna options

Unite* and Highway access covers are the only ranges on the UK market to include provisions for communications equipment, such as antennas, to be installed within the cover.

Antenna in cover linked to hardware in chamber

The ID bolt provision can be used for antennas, allowing communications equipment, such as water meter monitoring, to be installed within a chamber beneath a cover while providing a strong signal above ground without the need to dig or adjust the surrounding road surface. Saving time, effort and money while minimising disruption.

* references ending /KUE

Highway D400 Halohinge lifting mechanism
Highway

Are you looking for hinged access covers?

An expansion of the Highway range, our hinge and lift out HaloHinge manhole covers can be safely removed using our safety keyways and standard BS 7903 lifting keys, but can also be hinged to 100°, where they are secured in place.

HaloHinge's design incorporates inboard hinges (on the inside of the frame), this allows surfacing compaction against the straight edges of the frame whereas common alternatives, have protruding hinges that are difficult to compact around without damaging the hinge housing and covers foundation.

ClickLift installation
Manhole cover frame raising system

Clicklift compatible

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.

Armadillo manhole cover protector shell in place
The hard hat for your ironwork

Armadillo compatible

Armadillo is a complete range of protector shells, made 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 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.

Related case studies

Related case study

Years of high-quality performance

Our Highway D400 covers are still operating at full capacity after three and a half years of being subjected to high levels of HGV traffic. Meaning the organisation can focus solely on new work, rather than being distracted by manhole covers that have failed prematurely and need fixing or, in some cases, reinstalling.

Scottish Water
Read more
Related case study

Ensuring a smooth commute between Northern Ireland’s biggest cities

The Department for Infrastructure in Northern Ireland committed to funding a £185m ‘flagship’ infrastructure project to upgrade the A6, with the aim of reducing congestion and improving road safety. Richard Stewart, Regional Director ‑ UK North & Ireland at Wrekin Products, explains how a combination of excellent service and just in time deliveries secured an exciting opportunity to supply Highway® manhole covers and gully grates to such a significant project.

Department for Infrastructure Graham Construction Farrans
Read more