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Plastic Underground Drainage
Our Plastic Underground Drainage range is designed for dependable, long-lasting water management below ground. Ideal for new builds, extensions and repair work, plastic underground drainage systems provide a practical solution for carrying waste and surface water safely away from properties. With durable pipework and compatible fittings, these systems are built to perform in ground conditions while remaining straightforward to install.
Plastic underground drainage is commonly used for connecting soil and waste outlets, rainwater runs and underground pipe networks, helping prevent pooling, damp issues and water build-up around buildings. Plastic pipework offers consistent sizing, easy handling and secure jointing, making it a popular choice for both trade professionals and home improvement projects. Using the correct connectors, bends and access fittings ensures a watertight finish and helps reduce future maintenance.
For best results, plan your route carefully, maintain the correct fall for steady flow, and install on a suitable bed with proper backfill to protect the pipework. Whether you’re replacing a section or installing a full system, choosing compatible components helps deliver a tidy, reliable drainage run.
Shop online today for plastic underground drainage pipes and fittings with convenient ordering and delivery available.
300mm x 45 deg Double Socket Bend
The Brett Martin 300mm Twinwall 45° Double Socket Bend is a twinwall drainage fitting designed to create a swept 45° change of direction in 300mm underground surface water systems. Double socket ends support quick installation and reliable jointing on large drainage schemes.
£185.68 INC VAT
300mm x 45 deg Triple Socket Equal Branch
The Brett Martin 300mm Twinwall 45° Triple Socket Equal Branch is a heavy-duty twinwall drainage junction designed to create a swept 45° branch connection in 300mm underground surface water drainage systems. With triple socket ends, it supports stable connections in large-capacity drainage networks.
£426.17 INC VAT
300mm x 90 deg Double Socket Bend
The Brett Martin 300mm Twinwall 90° Double Socket Bend is a heavy-duty twinwall drainage fitting designed for right-angle direction changes in 300mm underground surface water drainage networks. With double socket ends, it provides secure connections for large-capacity site drainage installations.
£191.16 INC VAT
300mm x 90 deg Triple Socket Equal Branch
The Brett Martin 300mm Twinwall 90° Triple Socket Equal Branch is a heavy-duty twinwall drainage junction fitting designed to create a 90° branch connection in 300mm underground surface water drainage networks. Featuring triple socket ends, it supports secure jointing for large-capacity site drainage systems.
£426.17 INC VAT
315mm Dia Shallow Access Chamber Riser (185mm Invert)
The Brett Martin 315mm Dia Shallow Access Chamber Riser (185mm Invert) is an extension section for increasing the height of compatible 315mm shallow access chambers. Ideal for aligning to finished ground levels, it supports a tidy chamber installation and reliable access.
£27.48 INC VAT
315mm Dia. Shallow Access Chamber Base 190mm Invert (Inc. 2 Socket Plugs)
The Brett Martin 315mm Dia. Shallow Access Chamber Base (190mm Invert) including 2 Socket Plugs is a compact inspection chamber base designed for shallow drainage systems. Supplied with socket plugs for flexible connections, it supports reliable access for inspection and maintenance.
£46.40 INC VAT
315mm Dia. Shallow Access Chamber Sealed Lid (Driveway) 35kN*
The Brett Martin 315mm Dia. Shallow Access Chamber Sealed Lid (Driveway) 35kN is a heavy-duty sealed chamber cover designed for driveway applications. Rated to 35kN, it helps reduce odours and ingress while providing secure access for inspection and maintenance.
£73.58 INC VAT
315mm Dia. Shallow Access Chamber Sealed Lid (Pedestrian)
The Brett Martin 315mm Dia. Shallow Access Chamber Sealed Lid (Pedestrian) is a sealed cover designed for pedestrian areas, helping reduce odours and limit water ingress. Suitable for 315mm shallow access chambers, it provides a neat finished top for patios, paths and landscaped drainage access points.
£65.09 INC VAT
450mm Dia. Chamber Base (225mm Invert) (Inc. 3 Socket Plugs) 110mm
The Brett Martin 450mm Dia. Chamber Base (225mm Invert) with 3 Socket Plugs – 110mm is a versatile inspection chamber base for 110mm drainage systems. Supplied with socket plugs for unused inlets, it supports flexible chamber configuration with reliable access for maintenance.
£47.22 INC VAT
450mm Dia. Chamber Base (225mm Invert) (Inc. 3 Socket Plugs) 160mm
The Brett Martin 450mm Dia. Chamber Base (225mm Invert) with 3 Socket Plugs – 160mm is a robust inspection chamber base designed for 160mm drainage systems. With a 450mm chamber diameter and included socket plugs, it supports flexible configuration and practical access for maintenance.
£81.62 INC VAT
450mm Dia. Chamber Riser (315mm Invert)
The Brett Martin 450mm Dia. Chamber Riser (315mm Invert) is an extension section designed to increase the height of compatible 450mm inspection chambers. Ideal for matching finished ground levels, it supports accurate installation and reliable long-term access.
£33.80 INC VAT
450mm Sealing Ring (For Use With B5397)
The Brett Martin 450mm Sealing Ring (For Use With B5397) is a sealing accessory designed to improve watertight performance between compatible chamber components. Used with the specified system part, it helps maintain secure sealing and reliable chamber integrity.
£4.57 INC VAT
750mm Invert x 450mm Dia Road Gully
The Brett Martin 750mm Invert x 450mm Dia Road Gully is a deep road gully unit designed for effective surface water collection in highway and heavy-duty external environments. With a 450mm diameter body and 750mm invert depth, it supports high-capacity drainage and maintenance access.
£61.46 INC VAT
900mm Invert x 450mm Dia Road Gully
The Brett Martin 900mm Invert x 450mm Dia Road Gully is an extra-deep road gully designed for high-capacity surface water drainage in highways and heavy-duty environments. With a 450mm diameter and 900mm invert depth, it supports improved sediment capacity and drainage resilience.
£62.31 INC VAT
Aluminium Silt Bucket
The Brett Martin Aluminium Silt Bucket is a durable removable insert designed to capture silt and debris in compatible gullies and drainage chambers. Helping reduce blockages and simplifying maintenance, it’s ideal for external surface water drainage systems.
£101.83 INC VAT
Back Inlet Gully Raising Piece
The Brett Martin Back Inlet Gully Raising Piece is an extension component designed to increase the installed height of compatible back inlet gullies. Ideal for adjustments to finished ground levels, it helps achieve correct alignment with paving or surface finishes.
£13.05 INC VAT
Back Inlet Roddable Gully 90 deg Outlet Rectangular Grid*
The Brett Martin Back Inlet Roddable Gully (90° Outlet) with Rectangular Grid is a durable surface water drainage gully designed for efficient water collection and easy rodding access. With a back inlet and 90° outlet, it suits domestic and commercial drainage layouts.
£28.66 INC VAT
Back Inlet Roddable Gully 90 deg Outlet Round Grid*
The Brett Martin Back Inlet Roddable Gully (90° Outlet) with Round Grid is a robust surface water drainage gully designed for rodding access and efficient collection of rainwater. Featuring a back inlet and 90° outlet, it provides a practical connection point for underground drainage systems.
£28.66 INC VAT
Back Inlet Roddable Gully 90 deg Outlet Square Grid*
The Brett Martin Back Inlet Roddable Gully (90° Outlet) with Square Grid is a durable surface water gully designed for efficient run-off collection and straightforward rodding access. Featuring a back inlet and 90° outlet, it’s ideal for maintainable external drainage connections.
£28.66 INC VAT
Cascade Roundstyle 112mm 2m Gutter Black
The Brett Martin Cascade Roundstyle 112mm 2m Gutter in Black is a high-quality PVCu rainwater gutter with a cast iron effect finish, designed to replicate the traditional appearance of cast iron guttering while offering the lightweight durability of modern plastic systems.
£20.85 INC VAT
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