The Special Assembly is a narrow profile, high capacity drainage system that allows flexibility in outdoor design and construction, including wet-edge or infinity pool situations, patios, driveways etc.

90mm Drainpipe with 38G UPVC Channel

This patented manifold drainage system reduces the need for traditional wider grating.

The 38G90 is a 38mm wide UPVC channel and is connected via downpipes at 200mm intervals to sockets in a 90mm drain below.

This allows the channel to be installed level while the drainpipe is given sufficient fall to be self-cleaning.

The Special Assembly is then completed with a 38mm wide grate from the AR (wedgewire), PH (punched hole) or PS (slot punched) series.

This system is unique in the world and was recognised for its innovation with a DesignMark at the 2004 Australian International Design Awards.


  • Balcony
  • Courtyard
  • Driveway
  • Doortrack and Thresholds
  • Patios
  • Paved Area
  • Pool Area

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Stormtech | ODS


The finest linear grate selection from the people who invented them