Cast Square Aluminium Rainwater Pipes

Our Georgian Square Cast Aluminium Downpipe System comes with authentic looking collars inspired in design by 19th century cast iron downpipes. These Heritage cast downpipes look fabulous on listed, period or new properties, giving a true cast effect downpipe.

We offer two standard aluminium rainwater downpipe sizes but we can produce a range of square downpipe sizes.

Our standard sizes:

  • 75 x 75mm / 3"x3"
  • 100 x 100mm / 4"x4"

 Collar Brackets

These Traditional square cast downpipes fix directly to the wall with the cast collars giving a 35mm stand-off from the wall.  There is the option to use downpipe spacer bobbins if a greater stand-off is required or if there is an uneven wall to fix to.

Feature cast downpipe brackets offer extra detailing and Guttercrest manufacture Fleur de Lys and Clover Leaf designs. Alternatively we can match existing brackets or make brackets to your own design.


Our range of aluminium square cast downpipe fittings are comprehensive including bends, branches, swan necks, offset bends, plinth offsets, and rainwater diverters. All are available in both standard and special purpose-made fittings to suit your individual project.

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

Coatings and 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).



These traditional cast square downpipes look fabulous on listed, period or new properties, giving a true cast iron downpipe aesthetic.  Our aluminium square downpipes offer many benefits as they are easy to install, low maintenance, and lightweight yet very robust.

All our aluminium downpipes and gutter systems provide a sustainable rainwater system as 90% of the aluminium we use is recycled.

Our aluminium square 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 Width x Depth of the Downpipe

75mmx50mm - Product Code: RW32G

75mmx75mm - Product Code: RW33G

100mmx75mm - Product Code: RW43G

100mmx100mm - Product Code: RW44G



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