9 in. vs. 12 in. NDS Catch Basins
Both kits come as 4-packs with everything needed to connect pipe: a square basin, a black or green grate, two outlet adapters and an outlet plug per kit.
| 9 in. catch basin kit | 12 in. catch basin kit | |
|---|---|---|
| Openings | 2 | 2 side openings plus a removable bottom cutout |
| Pipe | Outlet adapters included | 3 in. through 8 in. with the right adapter |
| Best for | Downspouts, planter beds, narrow side yards, small patios | Large low spots, driveway and garage edges, where pipe runs meet |
| Traffic | Lawns, beds and walkways | Light vehicle traffic when properly installed |
| Price | $214.50 per 4-pack (about $53.63 per kit) | $255 per 4-pack ($63.75 per kit) |
| Shipping | $35 per 4-pack | $50 per 4-pack |
How to Install a Catch Basin
- Find the low spot where water collects, or the base of the downspout.
- Dig so the grate finishes flush with the grade.
- Fit the outlets: snap in adapters facing the pipe run and plug any unused opening.
- Run the pipe downhill to daylight, a storm drain or a dry well, then backfill, compact and set the grate.
Step-by-step details, depths and pipe sizing are in our catch basin installation guide.
Build the Rest of the System
No downhill outlet? Pipe the basin into a Flo-Well dry well. Carrying water a long way? Connect a gravel-free EZ-Flow French drain. Water sheeting off a driveway or patio? Add NDS channel drains along the edge.
Most orders ship within 4 business days and arrive in 3 to 6 business days. Orders over $2,000 ship free. Need a job-site quantity? Request a quote.
Catch Basin FAQs
What is the difference between a catch basin and a yard drain?
A yard drain is any grated inlet that takes surface water into a pipe. A catch basin is a yard drain with a box and a sump, so leaves and grit settle out instead of clogging the pipe.
Which size catch basin do I need?
Use the 9 in. basin at downspouts, in planter beds and in narrow side yards. Use the 12 in. basin for large low spots, driveway and garage edges, or where two pipe runs meet, since it connects to 3 in. through 8 in. pipe with the right adapter.
Can you drive over a catch basin?
The 12 in. NDS catch basin is suitable for light vehicle traffic when properly installed. The 9 in. basin is best suited to lawns, beds and walkways.
Where should catch basin water go?
Slope the outlet pipe downhill to daylight or a storm drain. If there is no downhill outlet, pipe it into a Flo-Well dry well so the water soaks back into the soil.
Can a catch basin be raised?
Yes. NDS makes 6 in. risers for both the 9 in. and 12 in. square catch basins for deeper installs.