A catch basin is usually put at the point that the trench drain evacuates the water into the underground pipework. They can be placed at the end of the trench run, or at any point along the trench run - depending on the underground pipe location and the ground topography.
In line trash buckets
fit the 900 series in line catch basin for the 4" and 8" systems.
Shallow trash bucket
fit the 620 series point catch basin and 900 series for 12" systems.
Deep trash buckets
fit the 630 series point catch basin and 900 series for the 12" systems.