Catch BasinAdapters & Outlets
Complete your catch basin installation with NDS adapters, outlets, and accessories. From universal pipe adapters (3" to 12") and stackable risers to debris filters and sump boxes—these components ensure reliable connections and easier maintenance for any drainage system.
Product Specifications
Key specifications for NDS catch basin adapters and accessories. Components are designed to work with all NDS square catch basins from 9" to 24".
Outlet Size Compatibility by Basin Size
| Basin Size | Available Outlets | Opening Options |
|---|---|---|
| 9" Basin | 3", 4" | 2 openings |
| 12" Basin | 3", 4", 6" | 2 or 4 openings |
| 18" Basin | 4", 6", 8" | 2 or 4 openings |
| 24" Basin | 6", 8", 10", 12" | 2 or 4 openings |
Catch Basin Accessories
Understanding the available accessories helps you specify a complete, maintainable drainage system.
Risers
Stackable risers add 6 inches of depth per section, allowing you to match final grade elevation or create deeper installations. Available for 9", 12", and 18" basins. Simply nest risers onto the basin body or onto each other—no tools or adhesives required.
Key Features
Common Applications
Installation Tips
Follow these guidelines for successful catch basin accessory installation and long-term system performance.
Size Risers Before Installing
Determine your final grade elevation before installation. Stack the appropriate number of risers on the basin and test-fit before setting in place. Easier to adjust above ground than after backfilling.
Slope Pipes Away
Ensure outlet pipes slope away from the basin at minimum 1% grade (1/8" per foot). Proper slope prevents standing water in pipes and ensures complete drainage after rain events.
Seal All Connections
Use appropriate sealants for your pipe type—solvent cement for PVC, compression fittings for corrugated. Unsealed connections allow groundwater infiltration and reduce system capacity.
Install Filters Accessibly
Position debris filters where they can be easily accessed for cleaning. Plan for regular maintenance—filters should be checked monthly during leaf season and after major storms.
Plug Unused Knockouts
If you don't use all outlet knockouts, leave them intact. Knocked-out but unused openings should be plugged with appropriate caps to prevent soil infiltration and maintain basin integrity.
Consider Future Access
Plan for sump box cleanouts and filter maintenance. Don't bury basins under permanent landscaping that prevents grate removal. Accessible basins are maintainable basins.
Adapters & Outlets FAQs
Common questions about catch basin accessories and connections
NDS offers universal outlets in sizes from 3 inches to 12 inches. The 9" basin accepts 3" and 4" outlets. The 12" basin accepts 3", 4", and 6" outlets. The 18" basin accepts 4", 6", and 8" outlets. The 24" basin accepts 6", 8", 10", and 12" outlets. Universal adapters allow connection to various pipe sizes.
Risers are stackable extension sections that nest onto the catch basin body to increase depth. Each riser adds approximately 6 inches of height. You can stack multiple risers to achieve your desired depth—essential for matching final grade elevation or creating deeper sumps for sediment collection.
A sump box is an extension that attaches below the catch basin, creating a deeper sediment trap below the outlet level. Heavy particles like sand and gravel settle to the bottom of the sump rather than flowing into drainage pipes. This protects pipes from clogging and reduces maintenance downstream.
Debris filters are basket-style inserts that sit inside the catch basin above the outlet. Water flows through the filter mesh while leaves, twigs, and sediment are captured in the basket. The filter can be lifted out for easy cleaning, preventing debris from entering and clogging drainage pipes.
Yes, NDS offers adapters for both smooth-wall (SDR/Schedule 40) and corrugated drain pipe. The universal outlet knockouts accept adapters that seal to corrugated pipe fittings. Make sure to select the correct adapter type for your pipe material and size.
The 2-opening basins have pre-molded knockouts on two opposite sides, suitable for straight-line pipe runs. The 4-opening basins have knockouts on all four sides, allowing pipe connections from any direction. Choose based on your drainage layout requirements and potential future expansion needs.
Risers are sized to match specific basin sizes. Use 9" risers with 9" basins, 12" risers with 12" basins, and so on. The risers have the same square profile as their matching basin and nest securely on top. NDS part numbers indicate the basin size the riser is designed for.
An atrium grate has a raised dome design that sheds leaves and debris, preventing them from accumulating on the grate surface and blocking water flow. Use atrium grates in areas with heavy tree cover or where leaf accumulation is a concern. They're also called "beehive" grates due to their shape.
Yes, you can knock out and connect multiple outlets on basins with 2 or 4 openings. This allows you to collect water from one inlet and distribute to multiple discharge pipes, or to connect multiple inlet pipes to a single discharge outlet. Plug any unused knockouts to prevent leakage.
NDS outlet adapters use rubber gaskets or solvent welding depending on the adapter type. For flexible connections to corrugated pipe, compression fittings create a watertight seal. For PVC connections, use appropriate PVC primer and cement. Always ensure connections are properly sealed to prevent groundwater infiltration.
Resources & Downloads
Technical documentation, installation guides, and specification sheets for catch basin accessories
Catch Basin Accessories Guide
Complete guide to risers, filters, and adapters
Catch Basin Installation Guide
Step-by-step installation with outlet connections
Pipe Connection Specifications
Outlet sizing and pipe compatibility charts
NDS Pro Website - Catch Basins
Official manufacturer product page
Complete Your Catch Basin System
The right adapters and accessories ensure reliable performance and easy maintenance. Contact us to discuss your project requirements or shop our complete selection.