12″ Square Basin Riser

A 12″ Square Basin Riser manufactured from High Impact Polystyrene (HIPS) which is used to extend the height of the basin by approximately 6″. The riser fits the 12″ Square Catch Basin and can easily be stacked together to increase the height even further. Also available in a 9″ model.



  • Manufactured from High Impact Polystyrene (HIPS).
  • UV stabilized to protect from sun degradation.
  • Use to extend height on 12″ Square Catch Basins.
  • Installs directly on to top of 12″ Square Catch Basin and extends height by 6″.
  • Multiple risers can be stacked on top of each other to achieve desired height.
  • Made in the USA.


Dimensions: 12.25″ length x 12.25″ width x 7.00″ height
Weight: 2.15 lbs.
Extension Height:
Material: High Impact Polystyrene (HIPS)



Use with Square Catch Basin
Use with Square Flat Grates: 12″
Use with Square Atrium Grates: 12″



A 12″ Square Basin Riser used to extend the basin height by approximately 6″. Used with a 12″ Square Basin and can be easily stacked on top of each other.

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