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Rain Harvesting First Flush Diverter with Auto Valve

Rain Harvesting First Flush Diverter 4" with Auto Valve

Rain Harvesting WDDP120 Downpipe First Flush Diverter – 4" Pipe

Improve Water Quality by Diverting Contaminated First Runoff
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Product Overview

The Rain Harvesting WDDP120 Downpipe First Flush Diverter is designed to enhance rainwater quality by preventing the first dirty runoff from entering your tank. Ideal for residential systems, this diverter captures roof debris, dust, and contaminants, ensuring that only cleaner water moves into your rainwater harvesting system.

Ensure Superior Rainwater Quality with the Rain Harvesting First Flush Advanced 4"

Elevate your rainwater harvesting system with the Rain Harvesting First Flush Advanced 4", an indispensable pre-filtration device engineered to significantly improve the quality of your stored water. This advanced diverter meticulously captures and diverts the initial, most contaminated flow of rainwater – laden with leaves, sediment, bird droppings, and airborne pollutants – away from your storage tank. By preventing these impurities from entering your tank, you ensure a purer, healthier water supply and safeguard the longevity of your entire rainwater infrastructure.

Key Features & Benefits

  • Optimized Water Purity: Effectively diverts the ‘first flush’ of dirty rainwater, allowing only cleaner, higher-quality water to enter your tank.
  • Protects Your System: Prevents harmful sediment and debris from damaging pumps, filters, and internal plumbing, extending their lifespan and reducing maintenance needs.
  • Advanced Sealing Mechanism: Utilizes a reliable ball and seat design to ensure a tight seal, preventing clean water from escaping after the first flush has been diverted.
  • Durable, UV-Stabilized Construction: Manufactured from robust, UV-stabilized PVC, engineered to withstand harsh outdoor conditions for years of dependable performance.
  • Easy 4-Inch Installation: Designed for straightforward integration into existing or new 4-inch (DN100) downpipe systems, minimizing installation time and effort.
  • Low Maintenance Design: Features a slow-release drain that automatically empties the chamber, preparing the unit for the next rainfall with minimal intervention.

Common Uses & Applications

The First Flush Advanced 4" is a critical component for any serious rainwater harvesting setup, enhancing water quality across a multitude of applications:

  • Residential Rainwater Harvesting: Ideal for homes collecting rainwater for garden irrigation, laundry, toilet flushing, and even potable use after appropriate further filtration and treatment.
  • Commercial & Industrial Use: Improves water quality for non-potable commercial operations, landscaping, and agricultural irrigation.
  • Extends Appliance Life: Protects expensive household appliances such as washing machines and dishwashers from sediment damage, reducing repair costs.
  • Enhances Filtration Efficiency: Reduces the load on downstream filters and purifiers, allowing them to operate more efficiently and last longer.

Invest in the future of your rainwater supply. Choose the Rain Harvesting First Flush Advanced 4" today and ensure a consistently cleaner, more reliable water source for all your needs.



nufacturer Info
Product Part #WDDP120
ManufacturerRain Harvesting
Shipping Weight (lbs)5.0000
Installation InstructionsRain Harvesting WDDP120 Installation Instructions
Physical Features
Weight (lbs)5
ColorNatural White
Product TypeRainwater Diverter
Shipping Info
Shipping LocationsTexas
Shipping Zip Codes77084
Liftgate OptionYes

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Product Information
Product Details
Key Features
  • Model: WDDP120

  • Application: Suits 4" (100mm) round downpipes

  • Material: UV-stabilized, impact-resistant PVC

  • Capacity: Adjustable based on diverter pipe length

  • Mechanism: Ball and seat system with slow-release drain valve

  • Installation Orientation: Vertical inline installation


✅ Benefits

  • Cleaner Tank Water – Diverts roof dust, debris, bird droppings, and other pollutants away from the tank

  • Adjustable Diverter Volume – Customize the pipe length to match roof size and rainfall volume

  • Reliable Reset – Ball and seat mechanism automatically resets after each rainfall

  • Durable and UV Resistant – Built for long-lasting performance in outdoor environments

  • Simple Maintenance – Easily accessible components for cleaning and inspection


Installation Overview

  1. Cut into the vertical 4" downpipe at the desired height

  2. Install the T-junction and diverter chamber

  3. Attach the ball seat, ball, and end cap with the release valve

  4. Adjust diverter pipe length based on required first flush volume


Shipping & Handling

  • Package Dimensions: 32" L × 12" W × 10" H

  • Shipping Weight: Approximately 8 lbs

  • Packaging: Individually boxed with fittings and installation guide

  • Delivery Method: Ships via standard ground service


Rain Harvesting Downpipe First Flush Advanced Water Diverter, part# WDDP120 diverts more contaminants and gives you greater control over water volume. The First Flush Diverters are installed using a T junction or high flow inlet to which the diversion chamber is fitted. As the chamber fills with the initial dirty water, a ball rises until it seals the inlet, allowing the rest of your rainwater, which is much cleaner, to flow directly to your tank.


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