Ensures controlled rainwater draining to the channel when the infiltration system is overloaded. 

Ideal for high retention drainage


  • Choke drain shaft with external access
  • Compatible with Platin tank 1,500 to 7,500 l and Carat tank 2,700 to 6,500 l and Carat XL/XXL tank 8,500 to 122,000 litre
  • Also possible with other retention tanks
  • Volume flow adjustable from 1.0 litres to 2.0 litres per second
  • Factory-set volume flow if required



Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
Choke drain shaft, suitable for vehicle loading62085096055340029
Choke drain shaft, suitable for pedestrian loading62085096024340028

calculated size Request for information