Inspection Chambers

Our Inspection Chamber Product Range

We offer a diverse selection of inspection chambers from reputable brands such as Clark Drains, FloPlast, and Turtle Enviro to meet specific needs:

• 300mm Inspection Chambers: Also known as shallow inspection chambers, they are ideal for shallow installations and areas with limited space, these mini access chambers provide sufficient access for maintenance in compact drainage systems.
• 450mm Inspection Chambers: Suitable for standard residential and commercial applications, offering ample access for routine inspections and cleaning.
• 600mm Inspection Chambers: Designed for larger-scale or industrial projects, these chambers facilitate easy entry for comprehensive maintenance activities.

Inspection Chamber Structure and Components

An inspection chamber is made up of several essential parts, all designed to ensure efficient drainage system access and maintenance. Our complete sets include these components, but they can also be purchased separately for custom installations.

• Inspection Chamber Bases – The foundation of the chamber, designed with pre-formed inlets and outlets to connect securely with drainage pipes of different diameters. It ensures stability and facilitates smooth water flow.
• Inspection Chamber Risers – Stackable risers allow for adjustable chamber depth, catering to specific site requirements. Some of our risers are fitted with an integral watertight seal  to maintain system integrity. Additional risers and seals can be added as needed, and the top riser can be trimmed for a flush finish with the ground level, ensuring a safe and neat installation.
• Inspection Chamber Covers – The top closure of the chamber, built from durable materials such as cast iron or high-density polyethylene (HDPE) to withstand various load ratings (in accordance with BS EN 124). Covers are available in different shapes and finishes, including round or square covers, to match project specifications and provide secure, tamper-resistant access.

For more details on inspection chambers and their role in underground drainage, explore our resources or watch our instructional video on installation and usage.

Key Uses of an Inspection Chamber

1. Inspection & Monitoring – Allows for visual checks to assess the condition of underground drainage pipes and identify any wear, cracks, or blockages.
2. Cleaning & Maintenance – Facilitates drain cleaning using rods or high-pressure water jetting to remove debris, sediment, or grease buildup.
3. Testing & Surveys – Provides access for CCTV drain surveys, enabling professionals to diagnose problems within the drainage system.
4. Flow Management – Helps regulate the flow of wastewater and surface water by ensuring smooth transitions between pipe sections, especially at junctions and changes in direction.
5. Regulatory Compliance – Required in certain locations within a drainage system to meet building regulations, ensuring proper maintenance access and system efficiency.

Where Are Inspection Chambers Required?

• At changes in pipe direction (30 degrees or more)
• At pipe junctions where multiple drainage pipes meet
• At intervals (typically every 22 metres) along long pipe runs
• Where there is a change in pipe diameter or gradient
• At property boundaries for easy access to the drainage system

To learn more about inspection chamber applications, read our article about the use of inspection chambers.

By installing inspection chambers, property owners and drainage professionals can maintain efficient and long-lasting drainage networks with minimal disruption.

Inspection Chamber Installation Guide 

Proper installation is crucial for optimal performance. Follow these general steps:

1. Excavation: Dig an appropriate trench to accommodate the chamber, ensuring a stable base. The chamber is installed on a suitable bed dependent on the quality of the trench and backfill materials.
2. Base Placement: Position the chamber base, aligning it with the existing pipework.
3. Pipe Connection: Securely connect drainage pipes to the chamber inlets and outlets, ensuring watertight seals. Any unused side connections should be sealed with a plain socket plug.
4. Riser Assembly: Add sectional risers to achieve the desired depth, maintaining secure and watertight connections. Ensure sealing rings are used in conjunction with each riser section.
5. Backfilling: Carefully backfill around the chamber, compacting the material to prevent settlement. Backfilling is continued up to approximately 50mm of the finished ground level.
6. Cover Installation: Place the appropriate manhole cover, ensuring it is flush with the surrounding surface. The frame and cover are placed on a bed of concrete around the top of the uppermost shaft, and adjusted to the finished level. The frame is securely fixed through the wall of the chamber at the set location points using self-tapping screws.

For detailed instructions, please refer to our installation guides or consult with a qualified drainage professional.