Our product is measured by inside dimesnsions,  we have the following options for your catch basin: standard grate, cast iron grate or concrete lid with ring/cover or ring/grate.  Click on the image below to see a drawing of the product. 

2' x 2' x 2' I.D.

2' x 2' x 4' I.D.

2' x 2' x 6' I.D.

2' x 2' x 3' I.D.

3' x 3' x 6' I.D.

3' x 3' x 2' I.D.

3' x 3' x 3' I.D.

3' x 3' x 4' I.D.

4' x 4' x 4' I.D.

4' x 4' x 6' I.D.

We have the following extensions for our 2' x 2' and 3' x 3' boxes 

4", 6", 8",10",12",18" and 24"

Thinwalls, 6" floor and walls,

2" x 2" angle frame.

Grate size 27 1/2" square

concrete lid is 3' x 3' x6"

Thinwalls, 6" floor and walls, 

2" x 2" angle frame. 

Grate size 39 1/2" square. 

Concrete lid 4' x 4' x 6" 

6" walls and 8" lid with blockouts

5' x 5' x 8" concrete lid with one of the following, ring/cover, ring/grate or frame/grate. 

Extentension starting at 6"