NDS 420 3 in. Pop-Up Drainage Emitter – Green
Brand: NDS | SKU: 420
Product Overview
The NDS 420 pop-up drainage emitter provides a controlled discharge point at the end of a buried drainage system. Water pressure lifts the green cap when runoff reaches the outlet, allowing collected water to discharge at the surface. As flow drops, the cap closes again, helping keep debris and small animals from entering the drain line during dry weather.
Key Features
- Pressure-activated pop-up cap
- Green HDPE construction
- Stainless-steel spring
- Closes when drainage flow subsides
- UV inhibitor for outdoor exposure
Common Uses
Residential and light-commercial drainage installations where compatible NDS components are used to collect, connect or discharge surface water.
Technical Specifications
- Material: HDPE
- Color: Green
- Listed pipe compatibility: 3 and 4 in. sewer-and-drain pipe/fittings
- Listed flow rate: 40 GPM
- Spring: Stainless steel
- Opening pressure: Approximately 0.04 PSI / 1 in. water
Compatibility & Installation Notes
Install at the discharge end of a compatible gravity-drainage system and maintain a suitable outlet elevation and slope. The surrounding area must be able to safely accept the discharged water.
Frequently Asked Questions
How does the emitter open?
Hydrostatic pressure from water moving through the drain line lifts the cap; it closes again as flow diminishes.
Why does the cap close?
Closing during dry weather helps keep surface debris and small animals from entering the drainage pipe.
Why Buy From Big Frog Supply?
NDS 420 gives buried drainage systems a low-profile green surface outlet that opens automatically when runoff needs to discharge.
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