The 9 in. NDS catch basin is the compact yard drain box: small enough to sit at the foot of a downspout or tuck into a planter bed, with a sump that catches leaves and grit before they reach the pipe. This pack has four complete kits, enough for the downspouts on most houses.
9 in. Catch Basin Kit Contents
- 1 NDS 9 in. square 2-opening catch basin
- 1 grate: black or green
- 2 outlet adapters
- 1 outlet plug
4 kits per pack (900BLKIT-4 black, 900GRKIT-4 green), about $53.63 per kit.
9 in. Catch Basin Specifications
| Basin size | 9 in. x 9 in. square |
|---|---|
| Openings | 2 (a 4-opening basin is available from NDS) |
| Material | Polypropylene (PP) basin and HDPE grate, both treated with UV inhibitors |
| Grate colors | Black or green |
| Raising | NDS 6 in. riser available for deeper installs |
Specifications: NDS Square Catch Basins (manufacturer product page and technical documents), checked September 2026.
Best Places for a 9 in. Catch Basin
- At the base of downspouts
- Planter beds and narrow side yards
- Small patios and walkways
- Irrigation runoff spots
Installing a 9 in. Basin at a Downspout
- Dig beside the downspout so the grate will sit at grade.
- Snap in the outlet adapter facing the pipe run; plug the other opening.
- Run drain pipe downhill to daylight, a dry well or the street.
- Backfill, set the grate, and connect the downspout.
Video: NDS, "How to Install a Catch Basin to Capture Run-Off."
Handling a bigger low spot or a driveway edge? The 12 in. catch basin 4-pack gives a larger inlet and connects to pipe up to 8 in. with the right outlet adapter. Pair with a Flo-Well dry well when there is no downhill outlet.
Shipping
Shipping is $35 per 4-pack by common carrier, and orders over $2,000 (10 or more 4-packs) ship free. Most orders ship within 4 business days and arrive in 3 to 6 business days.
9 in. Catch Basin Price & Cost
The 4-pack is $214.50, or about $53.63 per kit. Shipping is $35 per 4-pack, so one 4-pack is $249.50 delivered (about $62.38 per kit). Orders over $2,000 ship free: 10 or more 4-packs (40 kits) come to about $53.63 per kit delivered.
Buying nine 4-packs? Nine cost $2,245.50 delivered ($1,930.50 + $315 shipping), while ten cost $2,145 with free shipping, so the tenth pack lowers your total by $100.50.
Other Sizes & Alternatives
Bigger low spot or driveway edge?
The NDS 12 in. catch basin 4-pack has a larger grate and connects to 3 in. through 8 in. pipe.
Water sheeting across a patio or driveway?
Use a channel drain along the edge: the NDS 864 Pro Series channel drain kit with galvanized grate.
No downhill outlet for the pipe?
Send the water to an NDS Flo-Well dry well or an EZ-Flow gravel-free French drain.
Ordering 25 or more 4-packs?
For contractors, builders and municipal projects, request a quote with your delivery ZIP code and grate color. We quote freight and delivery to your site, and tax-exempt orders are welcome.
Downloads & Resources
- 9 in. catch basin landscape installation detail (NDS, PDF)
- 9 in. catch basin pedestrian and vehicular traffic installation detail (NDS, PDF)
- 9 in. catch basin riser and drain installation detail (NDS, PDF)
- 6 in. riser for 9 in. catch basin, #916 (NDS, PDF)
- Catch basin, grate and outlet flow capacities (NDS, PDF)
- NDS drainage product catalog (PDF)
- NDS 9 in. catch basin kit specifications (900BLKIT)
Frequently Asked Questions
Can I put a 9x9 catch basin under a downspout?
Yes. NDS lists downspouts as a main use for its 9 in. square basins. Set the basin at the base of the downspout and run pipe to a safe outlet.
How much water can a 9 in. catch basin handle?
NDS rates the kit's 9 in. square grates (#980 black, #990 green) at about 115 gallons per minute with 1/2 in. of water over the grate, and each standard #1243 outlet at about 68 gallons per minute.
What pipe does the 9x9 catch basin fit?
The included locking outlet adapters connect to 3 in. and 4 in. sewer and drain, single-wall corrugated, triple-wall and DWV/Schedule 40 pipe, with no tape or glue.
Is there a 9x9 catch basin with 4 openings?
Yes. NDS makes a 9 in. square catch basin with 4 openings, sold separately. This kit uses the 2-opening basin.
Can a 9x9 catch basin be raised to meet grade?
NDS makes a 6 in. riser for the 9 in. square catch basin for deeper installs.
Should I choose 9 in. or 12 in.?
Choose 9 in. for a downspout or a small planter bed. Choose the 12 in. basin for a larger low spot, a driveway edge, or where you need a larger inlet or bigger pipe (6 in. or 8 in.).