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Below Ground Drainage
Our Below Ground Drainage range is designed to help you install reliable underground drainage systems for managing waste and surface water effectively. Whether you’re working on a new build, extension, landscaping project or repair job, quality below ground drainage products support safe water movement and help prevent issues such as pooling, blockages and ground saturation.
Below ground drainage is commonly used for connecting soil pipes, waste outlets and rainwater systems into a secure underground network, directing water away from buildings and outdoor areas. Using the correct pipework, fittings and connectors ensures a watertight installation and reduces the risk of future maintenance problems. With durable materials made to perform in ground conditions, these systems are built for long-term use in both domestic and commercial settings.
For best results, plan the drainage route carefully, ensure the correct fall for steady flow, and use compatible fittings throughout the system. Proper bedding and backfilling also helps protect pipework and maintain stability over time. Whether you’re replacing a damaged section or installing a complete run, having the right components makes the job quicker and more reliable.
Shop online today for below ground drainage supplies with convenient ordering and delivery available.
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.
£58.62 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.
£24.28 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.
£3.28 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.
£44.14 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.
£44.75 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.
£73.13 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.
£9.37 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.
£20.58 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.
£20.58 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.
£20.58 INC VAT
Brett Martin 110mm Plug (Permanent)
The Brett Martin 110mm Permanent Plug is a PVCu underground drainage fitting used to cap off unused 110mm pipe ends or sockets permanently. Designed for secure, watertight sealing, it’s ideal for dead-leg terminations and future-proofing drainage layouts.
£7.93 INC VAT
Brett Martin 110mm x 22 1/2 deg Long Radius Plain End Bend
Brett Martin 110mm x 22.5° Long Radius Plain End Bend is a durable PVCu underground drainage fitting designed to create a gentle directional change in 110mm drainage pipework. The long radius design improves wastewater flow while the plain end connections allow flexible installation using compatible couplers or socket fittings.
£37.72 INC VAT
Brett Martin 110mm x 45 deg Long Radius Plain End Bend
Brett Martin 110mm x 45° Long Radius Plain End Bend is a durable PVCu underground drainage fitting designed to create a smooth directional change in 110mm drainage pipework. The long radius design improves wastewater flow while the plain end connections allow flexible installation using compatible couplers or sockets.
£37.72 INC VAT
Brett Martin 150mm Twinwall x 90° Triple Socket Equal Branch
The Brett Martin 150mm Twinwall 90° Triple Socket Equal Branch is a twinwall drainage junction fitting designed to create a 90° branch connection in 150mm twinwall surface water and land drainage systems. Triple socket ends provide secure connection points for efficient underground drainage layouts.
£58.89 INC VAT
Brett Martin 160mm Socket Plug
The Brett Martin 160mm Socket Plug is a PVCu underground drainage accessory designed to blank off a 160mm socket opening securely. Ideal for unused outlets and future connections, it supports watertight integrity in foul and surface water drainage systems.
£25.12 INC VAT
Brett Martin 160mm Square Alloy Sealing Plate
The Brett Martin 160mm Square Alloy Sealing Plate is a durable cover plate designed to seal compatible 160mm square hopper or gully tops. Ideal for temporarily or permanently blanking an opening (application dependent), it helps protect drainage connections and maintain a tidy finish.
£28.41 INC VAT
Brett Martin 160mm Square Hinged Alloy Grid
The Brett Martin 160mm Square Hinged Alloy Grid is a robust metal grid cover designed for compatible 160mm square hopper and gully tops. With a hinged design for easier access, it supports maintenance-friendly external drainage installations.
£27.65 INC VAT
Brett Martin 300mm Twinwall x 90° 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.
£137.29 INC VAT
Brett Martin 300mm Twinwall x 90° 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.
£306.07 INC VAT
Brett Martin StormCrate55 Connector (4 inc with each crate)
The Brett Martin StormCrate55 Connector (4 included with each crate) is a joining clip designed to securely connect StormCrate55 attenuation crates during installation. It helps maintain alignment and stability, supporting reliable assembly of stormwater storage and soakaway systems.
£10.41 INC VAT
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