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D400 manhole covers and gully grates

Our extensive D400 ranges of products are all suitable for Group 4 locations, and offer numerous unique features and benefits allowing the specifier to ensure they can offer the perfect solution for their application. Our most popular ranges of D400 products include Unite, Highway and TriStar.

Unite D400 Manhole Cover
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Whether you are looking for live project support, or are in the initial stages of specification, we are always on hand and happy to help.

Related case study

Years of exceptional 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
Scottish Water
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Related case study

M25 hard shoulder improvements

Mouchel were contacted by the Highways Agency (HA) and tasked with investigating the most cost effective and reliable way to utilise the hard shoulder of the M25 during peak rush hours. This posed several engineering problems, of which one was to consider the service life of the manhole covers that would now be located in the wheel track of one of Europe’s busiest stretches of motorway.

Mouchel
Mouchel
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