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Rectangular Inspection Chamber Section.
  • Rectangular Inspection Chamber Section.
  • Rectangular Inspection Chambers with cover.

1200 x 750 x 225mm Rectangular Inspection Chamber

CPM H127522B


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This product is only available in certain pack sizes. To purchase individual items please contact us for availability.

Product Details


Product Type: Rectangular Inspection Chamber 
Model Type: Banded
Clear Opening Size: 1200x750mm
External Dimensions: 1350x900mm
Chamber Depth: 225mm
Approx Weight: 173kg
Available Pack Sizes: 5’s only

This 1200x750x225mm precast rectangular concrete chamber section can be used to quickly build a chamber to access utility valves, hydrants and other pipework, or to act as shuttering around another chamber.

Manufactured with a tongue and groove joint, this section can be easily and securely stacked on top of others and sealed with either sand and cement mortar or bitumen sealant.

Product Features at a Glance:

  • Easy to handle and quick to build
  • Tongue and groove joint for stacking
  • Traditionally used in favour of brick-built chambers.
  • Concrete sections to take dug out material or concrete backfill
  • Manufactured to BS EN 1917:2002 / BS 5911-4:2002

Customer Notice: Rectangular chamber sections are banded in pack sizes and cannot be split: 1200x750x150mm = 8's, 1200x750x225 =5's. 

These units comply with the recommendations in the Water Services Association publication Sewers for Adoption, where the manhole from ground level to the pipes soffit/obvert (highest point of a pipes internal surface) is less than 1.50m in light or main road situations.

CPM's Rectangular Inspection Chambers have a tongue and groove joint and are manufactured and tested in accordance with BS EN1917/BS5911-3.

To complete a rectangular inspection chamber built with these sections, CPM have a range of rectangular concrete manhole cover slabs for 600x600mm (Light Duty and Heavy Duty), 900x600mm and 1200x675mm access openings. 

Manufacturer’s Advice: For rectangular manholes use 12mm x 60mm sealant (4.2m).

 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:
Inspection Chamber
Marshalls CPM
Nominal Size: