RainHarvesting Post/Wall Mount First Flush Diverter – 3" or 4" Inlet (WDPW99)
The WDPW99 Post/Wall Mount First Flush Diverter is a flexible and efficient way to remove the initial, most contaminated portion of roof runoff before it enters your rainwater tank. Designed for mounting to a post or wall, it accepts a 3" or 4" vertical inlet and requires a 12" vertical pipe (supplied by others) to act as the flush chamber.
This diverter improves water quality by capturing the “first flush” that typically contains dust, bird droppings, debris, and other contaminants. Once the chamber fills, the remaining cleaner water continues to your tank. The system is equipped with a manual flush valve for easy emptying and reset between rain events.
Product Details
Key Features
Mounts to a Post or Wall – Ideal for Tight or Custom Installations
Accepts 3" or 4" Vertical Inlet Pipes
Captures Dirty First Runoff to Protect Storage Tank Water Quality
Manual Flush Valve for Easy Cleaning and Maintenance
Durable, UV-Stabilized Construction for Outdoor Use
Compatible with Residential and Light Commercial Rainwater Systems
Specifications
Part Number: WDPW99
Mounting Type: Post or Wall Mount
Inlet Compatibility: 3" or 4" Vertical Pipe (Schedule 40 or DWV)
Chamber Pipe Requirement: 12" length of 3" or 4" pipe (not included)
Material: UV-Stabilized PVC or HDPE
Drain Type: Manual Flush Valve
Application: Rainwater harvesting, roof runoff control, pre-filtration
Dimensions
Main Chamber Height (with pipe): ~12–14 inches (depends on pipe used)
Inlet Diameter: Fits 3” or 4” pipe
Weight: Approx. 1.5 lbs (without pipe)