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Underground Drainage

Browse our selection of Underground Drainage pipe and socket for sewer, rainwater and services applications. Contact us on Live Chat or by phone 020 3481 1978 if you need help - Free Delivery on all orders over £300. Read Our Guide to know more about underground drainage.
110mm Underground Plug



160mm Underground Plug



What is underground drainage?

Underground drainage is the general term to sub-surface drainage. The system of pipes and fitting that is installed below ground level is known as underground drainage. This system is mainly used to transport foul drainage and rainwater flow to the sewage treatment facility.

What do you mean SUDS?

Sustainable Drainage System or Sustainable Urban Drainage System is a new way of thinking about how we drain our land and building.

What material are drainage pipes made of?


Un-plasticised polyvinyl chloride is the most frequently used for pipe installation. PVC-U is versatile, rigid and are suitable for both above and below the ground.

Cast iron

Cast iron drainage pipes are extremely durable and strong and can withstand high pressure. The installation of cast iron pipes consumes a bit of time and energy as they are often manufactured in short lengths due to their heavier weights. 


Chlorinated polyvinylchloride is widely used in water and sanitary system for hot and cold water distribution. CPVC can resist corrosion and have high tolerance for acids. These pipes are lightweight and non-toxic and fire-resistant.

Drainage gullies and gully traps

Drainage gullies allow you to connect pipes into an underground drainage system without allowing any smell to pass through the system. A gully trap is provided outside the building before connecting to external sewerage line to prevent foul gases to enter the building by providing a water seal.

Inspection chambers

Inspection chamber are the essential part of the underground drainage system providing access for inspecting, testing, and clearing blockage. This chamber allows the required authority to check the sanitary without disturbing the building owners. 

Benefits of underground drainage?

  • Provides an efficient way of waster water management and foul discharge from above ground drainage system.
  • Manufactured in PVC-U to give a strong durable product, lightweight and easy to work with and suitable for high temperatures and waste discharge. 
  • Fittings have an aesthetic modern look, are compact in size yet remain within the British Standard specification. 
  • Push-Fit joint through an innovatively designed seal and snap cap system. 


All Drainage Installations should be tested in accordance with the appropriate approving authority. If in doubt reference should be made to current editions of Building Regulations (Approved Document H).

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