CGL provides a selection of high-performance aluminium and HDPE BBA approved downpipes depending on your individual project needs.

There is a choice of downpipes depending on the project needs. For plastic we can provide an HDPE BBA Approved pipe system – the HDPE pipe is required to accommodate the flow and pressure of water in comparison to standard plastic pipe systems which do not comply with the necessary efficiencies or specification.

Pipe Features

  • CGL is the only UK manufacturer who supplies push-fit HDPE pipes
  • Push-fit pipes allow the pipes to be fitted without the need for an external installer
  • Small pipes diameters (75mm, 90mm, & 110mm) take up less space and use less material

The rainwater outlets’ efficiency has been tested and its capabilities are incorporated into our design software that allows CGL to design the relevant amount of outlets and pipes to suit each project. The rainwater outlets have been tested at the University of Sheffield to BS-EN 1253-2;2003 and comply with BS EN 12056-3 2000

We also offer aluminum downpipes which can be supplied in mill finish or a PPC finish. All pipes are specifically designed to suit the project requirements.

CGL Recommend the use of Flex-Seal Adaptor Couplings for connecting drainage pipes of differing materials and outside diameters together.


Backed by Merson Group and over 80 years of manufacturing expertise, we have the expertise and resources to deliver projects of every scale.


We have all of the necessary training and accreditations to deliver your needs in a safe, compliant and sustainable manner. With over 80 years of manufacturing excellence, we are dedicated to the achieving standards of excellence in every area of our business..


As part of the Fife council’s £200million investment programme in the local area, plans were approved for a full rebuild of Auchmuty High School. The new building was completed with CGL’s RainPulse system being utilised in its construction.

Auchmuty High School

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