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The retainer. For controlled drainage.

  • For use in conventional drainage outlets for targeted reduction of water intake
  • Optionally with or without dome grate depending on application
  • Simple insertion in the outlet pot without extra tools
  • With scaled adjusting slide or predefined opening
  • For controlled rainwater drainage

Specially developed for retention roofs, the SitaRetention product family ensures that the rainwater is retained for a certain period of time on the roof. SitaRetention Fix can upgrade any green roof to a retention roof. This guarantees controlled discharge of the rainwater for retention roofs.


  • Simple insertion in the outlet
  • Can be individually shortened