Skip to content
Green NDS420 pop-up drainage emitter showing top cap, wide flange, and spring-loaded design to fit 3- and 4-inch drain pipes, outdoor use.

NDS420 Pop-Up Drainage Emitter — Fits 3 in & 4 in

Brand: NDS
Save 25%
$27.26
$20.44
SKU NDS420
In Stock (139)

Notify me when back in stock

The NDS420 pop-up drainage emitter provides a reliable, low-pressure discharge point for stormwater and standing water. Designed for easy installation and concealed when not in use, the spring-loaded cap helps protect your landscape and structures by releasing collected water away from sensitive areas.

  • Fits 3" and 4" sewer and drain pipes: Compatible with standard 3-inch and 4-inch pipe/fittings for flexible installation.
  • High flow capacity: 40 G.P.M. discharge rate to quickly move standing water to a safe outlet.
  • Durable construction: Manufacturer specification lists high-density polypropylene construction with UV inhibitor for long outdoor life.
  • Low opening pressure: Stainless-steel spring requires approximately 0.04 PSI (about 1" of water) to raise the cap and begin discharge.
  • Compact footprint: Approx. 5-15/16" outer width and 1-1/4" height (product model 420), wide flange helps prevent turf overgrowth.

Ideal for yards, terraces, retaining walls, curb discharges and other low points where collected runoff must be directed away from buildings or erosion-prone areas. Routine inspection will keep the emitter free of debris and operating as intended.

Reviews

Frequently Asked Questions

What pipe sizes does the NDS420 fit?
Fits standard 3" and 4" sewer and drain pipe/fittings for flexible installation.
How much pressure is needed to open the emitter?
The spring opens at approximately 0.04 PSI (about 1" of standing water) to discharge flow.
What is the flow capacity of this emitter?
Rated for roughly 40 gallons per minute—sized for typical yard and landscape drainage.
What material is the emitter made from?
Manufacturer specifications list high-density polypropylene with UV inhibitor for outdoor durability.
Can it handle pedestrian traffic?
Yes; when properly installed the molded cover supports pedestrian traffic and light lawn equipment.