To answer the call for innovative methods of construction, that can reduce open excavations, offer cost savings with increase health and safety as well as promoting sustainable precast solutions, Marshalls CPM has developed a range of sealed manhole systems.

The Perfect Manhole and Preformed System are designed and manufactured to speed up manhole installation times, whilst providing a cleaner, safer working environment for site personnel and offering design freedom for engineers.

The Marshalls CPM Perfect Manhole can be installed in as little as 30 minutes and offers cost benefits with reductions in construction time, material wastage and skilled workforce, whilst providing an immediate watertight structure.

The Preformed System is available in 2100mm, 2400mm, 2700mm, 3000mm, 3660mm and 4000mm diameters and can be supplied with a Butyl sealant which removes the need for a concrete surround.

  • Preformed System

    Marshalls CPM has developed an off-site large modular manhole system that is designed to speed up the installation of the manhole.

    View Preformed System
  • The Perfect Manhole

    Marshalls CPM introduced the 1200 Perfect Manhole system in October 2009 to meet the challenges of modern day construction. Today, it is available in 1200mm, 1500mm and 1800mm diametres

    View The Perfect Manhole

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  • Do you supply certificates of conformity for your standard products?

    No – they are not required as our standard products are certified under the BS ‘Kitemark’ system – certification can be viewed here.

  • Where can I get additional assistance on the use of concrete drainage products?

    Additional assistance can be had via the Concrete Pipeline Systems Association, see

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