Rectangular Aluminium Rainwater Pipe

These Modern Rectangular Aluminium Downpipes come as standard with external pipe collars but are also available with an optional internal spigot creating a clean-looking flush joint downpipe. By fitting optional concealed (or secret fix) downpipe brackets this rectangular downpipe system can be fitted as a flush fit downpipe making it a suitable choice where an anti-vandal downpipe is required.

Our rectangular downpipes come in three standard sizes but can be manufactured in a comprehensive range of sizes to suit your individual project.

Our standard sizes are:

  • 75 x 50mm / 3"x2"
  • 100 x 75mm / 4"x3"
  • 150 x 100mm / 6"x4"


We produce a range of rectangular downpipe brackets including standard 35mm stand-off downpipe pipe clips, concealed brackets (or secret fix) for flush fit downpipes, semi-concealed brackets with stand-off, telescopic downpipe brackets ideal for stepped walls, vertical T brackets for fixing to window mullions, corner brackets, and cast decorative or special design downpipe brackets.


We produce a comprehensive range of complementary downpipe fittings including bends, branches, swan necks, offset bends, plinth offsets, and rainwater diverters which are available in standard sizes and also 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 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).


Our aluminium rectangular downpipes offer many benefits as they are easy to install, low maintenance, and lightweight yet very robust.

All our aluminium downpipe 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: RW32

75mmx75mm - Product Code: RW33

100mmx75mm - Product Code: RW43

100mmx100mm - Product Code: RW44

150mmx100mm - Product Code: RW64

150mmx150mm - Product Code: RW66



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