DMT0D4/6060/KU

Understand why seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications?

Frequently asked question questions about our ductile iron access cover range of products.

Unite's retrofittable seal plates are unique to the industry as all but one variant can be retrofitted on site after installation of the Unite manhole cover assembly. This installation works your through the steps involved for a correct installation.

Read our do's and don'ts for when installing a manhole cover frame

Installation guide for ductile iron BS EN 124 access covers.

The BS EN 124 standard serves as a general guide for determining the stability of products, and it outlines the parameters for different classes of products in terms of static load tests. However, it doesn't offer much specific information about the dynamic loads that various traffic conditions on modern road systems can impose. 

BS 7903:2020 provides guidance for the selection and installation of manhole tops and gully tops conforming to BS EN 124:2015, as well as other components and materials, to help form a safe, durable, maintainable installed system for highways.

The complete operation and maintenance (O&M) manual for all Wrekin BS EN 124 ironwork.

Recognising the importance of controlled access in maintaining the integrity and safety of civil engineering projects, we offer advanced locking options for our D400 & E600 manhole cover ranges.

Guidance on the symbols and iconography displayed on Wrekin ductile ironwork.

A handy guide showing the information on our product labels. This information will help you identify what products you have when picking, packing or installing on-site.

Where the loss of barrier coatings has occurred, usually through trafficking and/or light corrosion, a site-applied paint coating may be successfully brush-applied to refresh the surface finish of ductile iron parts.

This helpful guide can help you to ensure that the D400 manhole covers you choose are suitable for highway use.

Learn how to accurately measure manhole covers and gully grates with our helpful guide.

Installation guide for ductile iron BS EN 124 access covers when using a flowable mortar.

Our manhole covers provide multiple safe lifting provisions.

BS EN 124:2015 divides access covers and gully grates into classes by static test load. It also categorises the various places where they may be installed from Group 1 to Group 6. This article will guide you through the groups and classes.

A large number of our Unite and Highway covers provide the facility for a retrofittable badge to be installed in the cover, without the need for welding. In addition, this location can also be used to install communications antennas within the cover, removing the need to adjust the surrounding road surface.

This article discusses the potential applications of this technology.

Helpful information that guides you through applicable conformity marking and voluntary third-party certification requirements in the UK.

This same method can be used to lock all Wrekin Tristar, Highway, Unite and Hercules manhole covers and gully gratings.

Guidance on surface oxidation on iron castings, including what our covers are coated with and why we do this.

Understand the difference between anti-slip and anti-skid, how the results are measured and the standards behind it.

CD 534 v0.2.0 defines skid resistance test requirements that are based on a WRc test method for BS EN 124 conforming coarse textured cover surfaces. This article guides you through the test and our conformance.

A comprehensive feature comparison of our market leading Tristar, Highway and Unite ranges of access cover.

"CD 534 Chamber tops and gully tops for road drainage and services" has been revised, and is now at v0.2.0 as of September 2025. This knowledge base article will guide you through the key requirements and updates in Standards for Highways CD 534 v0.2.0.