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Concrete Manhole Cover Slab.
  • Concrete Manhole Cover Slab.

1500mm Concrete Manhole Cover Slab



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Product Details

This item is supplied to order and additional refund & returns terms apply.


Product Type: Concrete Cover Slab
Model Type: Central/Eccentric Access Opening
Chamber DN: 1500mm
Overall DN: 173 (Type 1), 1710mm (Type 2)
Maximum Thickness: 170mm
Manhole Access Size: (see below)
Approx Weight: 622kg - 1060kg

This reinforced concrete cover slab is designed for use as a cap for concrete manhole chamber rings that have a 1500mm nominal diameter. When installed, it provides an ideal base for a seating/adjusting ring and the fitting of a suitable manhole cover and frame.

Product Features at a Glance:

  • Multiple openings available
  • Cast in lifting rungs
  • Fits flush to the chamber ring
  • Manufactured from reinforced concrete
  • Heavy duty loading, suitable for use in main roads

This can be either a Central or Eccentric model with a Type 1 or Type 2 design (see below), depending on the access size chosen. It also benefits from cast in lifting rungs to aid in the safe positioning of the cover onsite.

Type 1 - the outer diameter is sized to slightly overhang the chamber ring it sits on.

Type 2 - the outer diameter is sized to fit flush with the the chamber ring it sits on.

Available with the following access openings:

  • 600x600mm (930kg, Eccentric, Type 2)
  • 675x675mm (787kg, Eccentric, Type 2)
  • 750x600mm (787kg, Eccentric, Type 2)
  • 750x750mm (679kg, Eccentric, Type 2)
  • 900x600mm (672kg, Eccentric, Type 2)
  • 900x900mm (870kg, Eccentric, Type 1)
  • 1200x675mm (1060kg, Central, Type 1)
  • 1200x675mm (622kg, Central, Type 2)

All access opening sizes come with 75mm corner chamfers.

Customer Notice: Cover slab access openings are 150mm from inside of chamber wall position unless otherwise stated.

Concrete cover slabs, also referred to as “biscuits", reducing slabs and lids, are used to complete the main shaft construction of a manhole chamber. Sitting on top of the chamber rings, they create a single access opening for maintenance purposes.

As well as acting as a platform to cap the manhole chamber, they also provide a base for any regulating brickwork or seating/adjusting units prior to finishing with the manhole lid.

 Key Features of CPM Concrete Products:

  • Quality - Precast concrete drainage products are manufactured in accordance with the relevant BS EN 1916/7, BS EN 5911 and CE marked where applicable. Goods are certified by Quality Assessment under the Kitemark Scheme and ISO 9001:2015.
  • Sustainability - Concrete pipeline systems are one of the most sustainable options available, they are manufactured from responsibly sourced materials, and can be made using recycled aggregates and cement replacements.
  • Proven Strength - They have a proven life of over 120 years, in normal groundwater conditions, are not weakened by fire or moisture and do not lose their shape. They are resistant to DC4 and impacts such as jetting, so blockages can be cleared easily.
  • Installed Cost Savings - Precast concrete pipes are rigid structural elements that do not always require a full granular surround, saving time in bedding and compaction. Excavated material can be reused and imported granular material can be reduced to a minimum.
  • Durability - Due to the inherent strength and durability of the Marshalls CPM precast concrete products, they are highly abrasion and corrosion resistant and don't lose strength over time.
  • Design Flexibility - Precast concrete drainage products can be used for a number of purposes, including sewerage and sustainable urban drainage systems (SuDS) applications such as stormwater attenuation and storage.
  • Water Tightness - Concrete pipes and manholes are designed to be watertight and are tested to pressure levels equivalent to a 5 metre head of water.
  • Fire Resistant - Concrete is naturally fire resistant. 

Please Note: 
All dimensions and weights are approximate as concrete product dimensions can have slight variations due to their manufacturing process. Customers should ensure that lifting equipment has sufficient capacity to allow for variations. All images shown are used for illustration purposes only and may differ from the actual product supplied. 

16-20 working days
Product Type:
Manhole Cover Slab
Marshalls CPM
Nominal Size: