Under Decking Water Tanks

Our under decking water tanks are slimline, tough and durable ideal for installing under the decking.   These tanks are used for collecting rainwater from your roof and divert it under your decking and from here use for garden watering or pump it to wash the car and pressure washing.

Our water tanks are available from 240 to 1000 litres for drinking water, wastewater and where space is an issue.  Our water storage tanks are rotationally moulded from virgin, high-quality polyethene and generally stocked for quick delivery.
Outlets are sometimes required in different positions than the standard position and fusion-welded sockets can be added and allowing greater flexibility for the position of inlets and outlets to suit your installation.

Please download our technical data sheet if you require additional fittings and mark the position of the fittings you require.  Please email this to us to place your order.  All customised tanks are non-returnable.

  • 240 Litre Squat Rainwater Harvesting Tank 

    240 Litre Rainwater Harvesting Tank Specification

    • Natural colour tank suitable for the storage of AdBlue
    • Supplied as standard with a 1.5” Outlet 177815 (other options available)
    • Lid: 255mm
    • Colours: Available in black, dark green, boat blue or natural colour
    • Dimensions (mm) 925 x 710 x 510
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Does your project need to meet Fluid Category 5 regulations?

    Please note: Tank sizes quoted are subject to a +/- 3% variation.

  • 400 Litre Squat Rainwater Harvesting Tank

    4,500 Litre Rainwater Harvesting Tank Specification

    • Supplied as standard with a 1.5” Outlet 177815 (other options available)
    • Lid: 255mm
    • Colours: Available in black, dark green, boat blue or natural colour
    • Dimensions (mm) 1600 x 710 x 510
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Does your project need to meet Fluid Category 5 regulations?

    Please note: Tank sizes quoted are subject to a +/- 3% variation.

  • 400 Litre Water Tank, Baffled, Flat

    400 Litre Baffled Water Tank Specification

    • WRAS approved polymer – black, boat blue or natural colour options, supplied with a Bye-law 30 kit (Bye-law 60 in Scotland)
    • Type AB Airgap can be fitted to all WRAS approved tanks as an optional extra
    • Outlet 1.5” 177815 (other options available)
    • Lid 255mm
    • Dimensions (mm) L 1200 x W 1050 x H 400
    • Available in black, natural or green, other colours available on request.
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Please note: Tank sizes quoted are subject to a +/- 3% variation

  • 500 Litre Baffled Water Tank, Flat

    500 Litre Baffled Water Tank Specification

    • WRAS approved polymer for black, boat blue or natural colour options only, supplied with a Bye-law 30 kit (Bye-law 60 in Scotland)
    • Type AB Airgap can be fitted to all WRAS approved tanks as an optional extra
    • Outlet 1.5” 177815 (other options available)
    • Lid 255mm
    • Dimensions (mm) L 1200 x W 1050 x H 500
    • Available in black, natural or green, other colours available on request.
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Please note: Tank sizes quoted are subject to a +/- 3% variation

  • 800 Litre Baffled Water Tank, Flat

    800 Litre Baffled Water Tank, Flat

    • WRAS approved, black, boat blue or natural colour options only, supplied with a Bye-law 30 kit (Bye-law 60 in Scotland)
    • Type AB Airgap can be fitted to all WRAS approved tanks as an optional extra
    • Outlet 1.5” 177815 (other options available)
    • Lid 255mm
    • Dimensions (mm) L 1350 x W 1200 x H 600
    • Available in black, natural or green, other colours available on request.
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Tank sizes quoted are subject to a +/- 3% variation

  • 1,000 Litre Water Tank, Baffled, Flat

    1,000 Litre Water Tank, Baffled, Flat

    • WRAS approved, black, boat blue or natural colour options only, supplied with a Bye-law 30 kit (Bye-law 60 in Scotland)
    • Type AB Airgap can be fitted to all WRAS approved tanks as an optional extra
    • Outlet 1.5” 177815 (other options available)
    • Lid 255mm
    • Dimensions (mm) L 1650 x W 1200 x H 600
    • Available in black, natural or green, other colours available on request.
    • 100% rust proof
    • UK manufactured
    • 10 year guarantee
    • Supplied direct from stock for fast delivery

    Please note: Tank sizes quoted are subject to a +/- 3% variation

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