The GreyFlow™ flush valve is an end-of-line flushing valve add-on to your GreyFlow™ greywater irrigation system

The flush valve clears out any sediment from your dripper field where the distribution of greywater could leave deposits

Suitable for all types of watering systems (sprinklers, drip, grey water & wastewater systems).

Simple, reliable, and easy to install, the GF Flush Value improves the long-term performance of your system by opening the flow of water from the pressure of the pump to clear the sediment out into the soak hole. This can be done per the bank of drippers.

By connecting these flush values to your dripper fields system, it can keep your drippers and land application area (irrigation fields) operating clean and healthy for years to come. 

Advantages:

• One valve operates manually
• High Flow flush with open valve
• Suitable for all types of watering systems (sprinklers, drip, greywater systems, and wastewater systems)
• Improves lifespan of the dripper system by preventing blockages and uneven drip patterns
• Simple, reliable, and easy to operate and install
• 2-year manufacturer's warranty

Installation:

• Flush with only clean or filtered water (minimum 40 mesh filtration) (hose from tank water)
• Fits outlet pipe sizes of 25mm
• Requires a minimum flow rate of 10 liters per minute to operate
• Position with soak hole and soak media in hole base
• Use our valve box (link) or a cover stone (flagstone)

Installation Diagram - Example

WCTNZ® is the exclusive authorized distributor of GreyFlow™ greywater systems in New Zealand. All GreyFlow™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties, and come with comprehensive local customer support—making us New Zealand’s trusted source for sustainable wastewater solutions.

Copyright © 2025 Waterless Composting Toilets NZ Limited (WCTNZ®). All short and long product descriptions and content are the property of WCTNZ® | Waterless Composting Toilets NZ. All rights reserved.

This content has been reviewed and approved by Dylan Timney, Managing Director of WCTNZ®, who brings over 17 years of composting toilet expertise and 16 years of experience in building and eco-construction in New Zealand.

Last reviewed: June 26, 2025