The NDS 422G-AST Pop-Up Drainage Emitter with Elbow is a high-performance solution for managing stormwater runoff in residential, commercial, and landscape applications. Designed to work seamlessly with 4-inch sewer and drain pipes or triple-wall pipes, this emitter provides a discreet, efficient, and clog-resistant way to discharge water away from structures, erosion-prone areas, and poorly drained landscapes.

With a durable high-density polyethylene (HDPE) cap and a polyvinyl chloride (PVC) elbow, the 422G-AST is built to withstand the elements while maintaining peak performance. Its pop-up cap mechanism activates under water pressure and closes when not in use—keeping debris and pests out of your drainage system.

Key Features & Benefits

💧 Automatic Water Release

As water pressure builds in the drainage system, the pop-up cap rises to release water at rates up to 56 gallons per minute (GPM). Once the flow subsides, the cap automatically closes, preventing backflow, debris entry, and rodent intrusion.

🛡️ Clog-Resistant Design

The emitter features rounded interior contours and internal ribs that reduce the risk of clogging. A weep hole at the bottom of the elbow allows residual water to drain, preventing stagnation and freezing in colder climates.

🌿 Low-Profile, Landscape-Friendly

The flat, green cap blends seamlessly into turf, mulch, or garden beds, maintaining the aesthetics of your landscape. A flanged base prevents turf overgrowth and ensures the emitter remains accessible for maintenance.

🔧 Easy Installation

The 422G-AST connects directly to 4-inch sewer and drain pipe or triple-wall pipe without the need for special tools. It’s compatible with a wide range of NDS drainage components, including catch basins, channel drains, and French drains.

🧱 Durable Construction

• Cap & Cover: High-Density Polyethylene (HDPE)
• Elbow: Polyvinyl Chloride (PVC)
  These materials offer excellent resistance to UV rays, chemicals, and physical impact, ensuring long-term durability.

Technical Specifications

• Model Number: 422G-AST
• Manufacturer: NDS, Inc.
• Connection Size: 4 in. (S&D and triple-wall pipe compatible)
• Flow Rate: Up to 56 GPM
• Material: HDPE (cap), PVC (elbow)
• Color: Green
• Dimensions: Approx. 6-3/4 in. L x 6 in. W x 4 in. Dia
• Installation: Direct connection to pipe; no adapters required
• Warranty: Limited Manufacturer Warranty

Applications

The 422G-AST Pop-Up Emitter is ideal for:

• 🏡 Residential Drainage Systems – Divert water away from foundations, patios, and driveways.
• 🌳 Landscape Management – Prevent erosion and pooling in lawns, gardens, and flower beds.
• 🏢 Commercial Properties – Manage runoff from rooftops, parking lots, and hardscapes.
• 🌧️ Stormwater Systems – Integrates with catch basins, French drains, and trench drains.