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    Drainage & Ducting

    Pattrick & Thompsons has been a trusted builders’ and timber merchant in King’s Lynn since 1865, offering quality Drainage & Ducting supplies—ideal for contractors, tradespeople, and homeowners. Drainage & Ductingsupplies  are available for delivery or can be collected in our King's Lynn store. If you still need some assistance, please contact us

    What You’ll Find Here

    • Below Ground Drainage – Choose from pipes, bottle gullies, access chambers, bends, couplings, and soakaway crates for robust underground systems.

    • Manhole Covers – Secure, load-rated access points for maintenance and service entries.

    • Channel Drainage – Durable linear surface drainage solutions—perfect for patios, driveways, and external paved areas.

    Why Shop with Us?

    • Local stock, local support – Visit our King’s Lynn site on Page Stair Lane for same-day click‑and‑collect or quick local delivery 

    • Expert advice – Our long-serving team of local professionals understands regional drainage standards—and can guide you to the best solutions Quality you can trust – We stock recognised brands and offer products compliant with UK regulations, backed by over a century of service .

    • Convenient purchasing options – Free delivery on orders over £50 plus flexible click‑and‑collect on all in‑stock items 

    🛠 Ready to Complete Your Project?

    Browse our Below Ground Drainage, Manhole Covers, and Channel Drainage sections now. Whether you're planning a build or repair, Pattrick & Thompsons delivers reliable stock, expert insight, and local convenience to get your project done right—on time.

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    Underground 110mm x 87 ½° B5041 Single Socket Bend

    Underground 110mm x 87 ½° B5041 Single Socket Bend
    Stock Availability: In stock
    £9.19 inc Vat

    Underground 110mm x 87½° B4031 Double Socket Bend

    Underground 110mm x 87½° B4031 Double Socket Bend
    Stock Availability: In stock
    £9.97 inc Vat

    Underground 110mm x 87½° B4081 Triple Socket Branch

    Underground 110mm x 87½° B4081 Triple Socket Branch size is a reliable and efficient solution for connecting two underground drainage systems. With its push-fit connection, it offers convenience and ease of installation. Crafted from robust and durable uPVC, this triple socket branch is not only sturdy but also lightweight, making it simple to handle during installation.
    Stock Availability: In stock
    £17.48 inc Vat

    Underground 110mm x 87½° B4131 D/S Rest Bend (Long Radius)

    Underground 110mm x 87½° B4131 D/S Rest Bend (Long Radius)
    Stock Availability: In stock
    £16.37 inc Vat

    Underground 110mm x 87½° B5101 Double Socket Branch

    Underground 110mm x 87½° B5101 Double Socket Branch is a top-quality drainage fitting manufactured in the UK to meet rigorous quality standards. This ensures that the installer receives a product range that is not only reliable but also performs consistently over time
    Stock Availability: Out of stock
    £16.80 inc Vat

    Underground 315mm B3150 Dia. Shallow Access Chamber Base (190mm Invert) inc. 2 Socket Plugs

    Underground 315mm B3150 Dia. Shallow Access Chamber Base (190mm Invert) inc. 2 Socket Plugs
    Stock Availability: In stock
    £33.58 inc Vat

    Underground 450mm B5397 Dia. Chamber Riser (315mm Invert)

    Underground 450mm B5397 Dia. Chamber Riser (315mm Invert)
    Stock Availability: In stock
    £28.30 inc Vat

    Underground 450mm B5398 Chamber Riser Sealing Ring

    Underground 450mm B5398 Chamber Riser Sealing Ring is specifically designed to ensure a secure and tight seal when connecting a chamber to a riser or riser to riser. This sealing ring plays a crucial role in maintaining an airtight and watertight connection, preventing any leakage or seepage.
    Stock Availability: In stock
    £3.41 inc Vat

    Underground 450mm B5494 Dia. Chamber Base (225mm Invert) (Inc. 3 Socket Plugs) 110mm

    Underground 450mm B5494 Dia. Chamber Base (225mm Invert) (Inc. 3 Socket Plugs) 110mm
    Stock Availability: In stock
    £44.09 inc Vat

    Underground 450mm Dia. Secured Round Plastic Manhole Cover for Driveways 50kN B6255

    Underground 450mm Dia. Secured Round Plastic Manhole Cover for Driveways 50kN B6255 - Round lid for 450mm access and inspection chamber (50kN).
    Stock Availability: In stock
    £50.39 inc Vat

    Underground B1001 Back Inlet Roddable Gully 90° Outlet Round Grid

    Underground B1001 Back Inlet Roddable Gully 90° Outlet Round Grid
    Stock Availability: In stock
    £31.06 inc Vat

    Underground B1006 Spare Square Hopper And Grid

    Underground B1006 Spare Square Hopper And Grid
    Stock Availability: In stock
    £12.59 inc Vat

    Underground B1007 Back Inlet Gully Raising Piece

    Underground B1007 Back Inlet Gully Raising Piece
    Stock Availability: In stock
    £8.18 inc Vat

    Underground Pipe Jointing Lubricant Gel 500g B9333

    Underground Pipe Jointing Lubricant Gel 500g B9333 - For use with Soil, Waste and Underground Drainage Systems
    Stock Availability: In stock
    £10.27 inc Vat

    Underground Shallow Access Chamber 110mm Spare Plug B5000

    Underground Shallow Access Chamber 110mm Spare Plug B5000 - Shallow Access Chamber Plugs are used to blank off unused inlets
    Stock Availability: In stock
    £4.46 inc Vat

    Underground Square Hopper 160x160mm x110mm Drainage Square Hopper B1071

    Underground Square Hopper 160x160mm x110mm Drainage Square Hopper B1071
    Stock Availability: In stock
    £15.22 inc Vat

    Ground Guard Grass Grid 585 x 385mm

    Ground Guard Grass Grid 585 x 385mm represent a lightweight yet remarkably efficient ground reinforcement system, ideal for stabilizing grass or gravel surfaces. The installation process is effortless, as the fittings seamlessly click together without the need for extra fixings or tools. Additionally, these tiles can be easily customized by cutting to shape, accommodating irregular edges with convenience.
    Stock Availability: In stock
    £6.28 inc Vat

    Aco 1m Hexdrain Channel & Plastic Grating A15

    Aco 1m Hexdrain Channel & Plastic Grating A15 - The ideal drainage channel for domestic applications, with integral plastic grating. Suitable for pedestrian and vehicle traffic up to Load Class A 15 including residential driveways, patios and pathways.
    Stock Availability: In stock
    £13.61 inc Vat

    Aco Hexdrain Accessory Bag

    Aco Hexdrain Accessory Bag - units are made from recycled polypropylene. The kit comes complete with the essentials for installing HexDrain drainage systems.
    Stock Availability: In stock
    £16.37 inc Vat

    Flexseal 100-115mm Drainage Coupling DC115

    Flexseal 100-115mm Drainage Coupling DC115 - Fernco, previously known as Flex seal Flexible EPDM Rubber Drain Coupler for Repairing or Connecting Non-Pressure Pipes Between 100mm to 115mm. Easy to Install Providing an Efficient, Airtight and Watertight Connection.
    Stock Availability: In stock
    £8.50 inc Vat

    Aco Hexdrain/Raindrain Closing End Caps

    Aco Hexdrain/Raindrain Closing End Caps provides a discreet slot drainage system for domestic up to 60mm block paving installation and threshold drainage.
    Stock Availability: In stock
    £4.05 inc Vat

    Flexseal 121-136 / 110-121mm Adaptor Coupling AC4000

    Flexseal 121-136 / 110-121mm Adaptor Coupling AC4000 - also known as a reducer coupling, is designed with a stepped moulded sleeve that allows it to connect unadopted drainage pipes together that have different outside diameters – connecting larger pipes to smaller pipes and vice versa. Each end has a stainless-steel clamping band used to create a strong seal between the pipe and the coupler.
    Stock Availability: In stock
    £8.50 inc Vat

    ACO HexDrain Corner Unit with Black Plastic Grate and Vertical Outlet

    ACO HexDrain Corner Unit with Black Plastic Grate and Vertical Outlet is part of the HexDrain family of products. HexDrain products are suitable for domestic applications up to Load Class A 15. The channels simply clip together, allowing for quick and easy installation, with an 80mm depth the ACO HexDrain is great for challenging domestic installations.
    Stock Availability: In stock
    £23.95 inc Vat

    PSM1A Polystorm Modular Water Storage Unit Soakaway Crate 1000x500x400

    PSM1A Polystorm Modular Water Storage Unit Soakaway Crate 1000x500x400 - Your soil type will determine the efficiency of the soakaway system. This crate has a compressive strengh of 61 tonnes/ m2.We recommend that your groundwork contractor undertakes a percolation test on your soil to calculate the correct number of crates for your application.
    Stock Availability: Out of stock
    £42.00 inc Vat