Cast Round Aluminium Rainwater Pipes

Our traditional round cast downpipe system stands out due to its authentic styled collars inspired by the designs of 19th century cast iron downpipes. These heritage cast downpipes look fabulous on listed and period properties or new builds, giving a true cast effect downpipe.

We offer four standard round cast aluminium rainwater pipes sizes:

  • 63mm / 2.5"
  • 75mm / 3"
  • 100mm / 4"
  • 150mm  / 6"

We may be able to manufacture alternative sizes of downpipe to your specification, please contact our technical or sales team for more information.

Collar Brackets

These traditional round pipes fix directly to the wall and when using the cast collar with ears give a 35mm stand-off from the wall. Downpipe spacer bobbins can be used if extra stand-off is required or you are fixing to uneven walls.

We produce a range of feature cast downpipe brackets which offer extra detailing to the downpipe system. Guttercrest produce Fleur de Lys and Clover Leaf styles or we can accurately match existing brackets or manufacture brackets to your own design.


We produce a range of complementary aluminium round downpipe fittings including bends, branches, swan necks, offset bends, plinth offsets, and rainwater diverters which are all available in either standard sizes or special custom-made sizes to suit individual projects.

We also have a range of hopper heads that look great with our range of aluminium traditional round downpipes.

Coatings & Finishes

All our aluminium rainwater pipes, downpipes and fittings are available polyester powder coated in a wide array of colours and finishes including the full range of RAL colours, BS colours, Heritage textured finishes, metallic finishes, and anodised coating.

We can also source special colours and finishes to match your project requirements or we can supply our aluminium gutters in the standard mill finish.

For more details please take a look at our colour chart (PDF).

Benefits of Aluminium Cast Round Downpipes

The Guttercrest Heritage cast round downpipes look fabulous on listed, period or new properties, giving true cast iron downpipe aesthetics. Our aluminium gutters provide a sustainable rainwater system as 90% of the aluminium we use is recycled.

Our aluminium round downpipes are suitable for use with a range of our other products including gutters, hopper heads and decorative feature brackets.

Please Note: Due to our ongoing product development policy, we reserve the right to alter specifications without prior notice.

Click here to use Estimator ↓

Guttercrest have created an easy to use programme called Estimator which is designed to help you quickly specify and cost the aluminium gutters, downpipes and accessories you need for your building project.


Sizes stated below are the Diameter of the Downpipe

63mm - Product Code: RW1T

75mm - Product Code: RW2T

100mm - Product Code: RW3T

150mm - Product Code: RW5T


Case Studies

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