NDS 421 4" Pop-Up Drainage Emitter with 90° Elbow

NDS 421 4" Pop-Up Drainage Emitter with 90° elbow provides a low-profile, secure discharge point for 4" drainage systems. The spring-loaded cap opens as water pressure builds—rising up to 1"—to release collected water at up to 56 GPM, then closes to keep debris and pests out. Built for landscape and stormwater applications, it directs runoff safely away from foundations and erosion-prone areas.

• Spring-loaded cap pops up to 1" to disperse water at up to 56 GPM; cap retracts to protect the system when flow diminishes.
• Durable construction: HDPE cap and cover with PVC elbow for long-lasting outdoor performance; wide flange prevents turf overgrowth.
• Weep hole in elbow drains residual water to minimize stagnation and reduce freezing risk; supports pedestrian and lawn-tractor traffic when installed per instructions.
• Connects to 4" sewer, drain, and triple-wall pipe for a soil-tight fit; compatible with Flo-Well, catch basins, and downspout discharge.
• Low-profile green finish blends into turf and landscaping while keeping a low trip profile and allowing mower clearance.

Easy to install and maintain, the NDS 421 offers reliable performance for residential and commercial drainage projects. Install at the system low point and discharge to a safe, water-tolerant area. Refer to the NDS product literature and installation guide for full specifications and submittal details.