12″ Square Atrium Grate

A rugged square, domed grate designed to be used in conjunction with a catch basin. This grate is manufactured from a structurally foamed High Density Polyethylene (HDPE) with a UV inhibitor to reduce sun damage. This grate has large opening slots for maximum flow while still preventing large debris from entering the drainage system. Typical application would be areas where floating debris would block a flat grate. This product is available in green and black. For safety reasons and to prevent vandalism or theft the grate has two holes enabling it to be screwed onto the basin. Available in 9″ and 12″ sizes.



  • Manufactured from structurally foamed High Density Polyethylene (HDPE).
  • UV stabilized to protect from sun degradation.
  • Available in green and black.
  • Fits 12″ catch basins.
  • Textured anti-skid surface.
  • Includes two bolt holes to secure to basin (use # 6 x 1.5″ flat Phillips head stainless screws).
  • Made in the USA.


Dimensions: 11.75″ length x 11.75″ width x 1.15″ height
Weight: 1.30 lbs.
Open Area: 50 sq in
Slot Width: 7/16″
Flow Rating: 65 GPM
Material: Structurally foamed High Density Polyethylene (HDPE) with UV inhibitor


Use with Square Catch Basin: 12″


A square domed grate that fits onto a catch basin used for large sized flower beds. The function of the catch basin is to collect sediment in it’s sump area and not allow this sediment to enter and plug the drainage pipe. For safety reasons and to protect from theft or vandalism grate can be screwed to catch basin. This style of grate is not suitable for pedestrian and bicycle traffic. The domed or atrium style is designed to prevent mulch or debris from plugging the grate openings.

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