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    GreyFlow™ | Feeder Pipe - Flow Restrictor

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    Brand: GreyFlow™
    SKU: GW GF-CV25
    GreyFlow™ flow restrictor for downhill feeder-pipe runs where the slope exceeds 3°, supplied with barb fittings, clips and check valve.
    Availability: Availability - on backorder and will be dispatched once in stock.
    $49.26 excl GST
    excluding shipping
    i h
    Products
    Greywater dripper-field accessory

    GreyFlow™ | Feeder Pipe - Flow Restrictor

    An additional flow restrictor for downhill GreyFlow™ feeder-pipe runs where the slope or gradient exceeds 3°.

    This accessory is used to help manage flow across GreyFlow™ dripper-field runs on sloping sites.

    Quantity
    1 unit
    Single restrictor assembly
    Gradient
    3°+
    For downhill runs
    Fittings
    25mm
    Barb fittings and clips
    System fit
    GWDD
    GreyFlow™ dripper fields
    Product use

    For downhill GreyFlow™ dripper-field runs

    The GreyFlow™ feeder-pipe flow restrictor is used where a dripper-field design includes downhill runs and the gradient exceeds 3°.

    It is supplied as an additional component for suitable GreyFlow™ GWDD dripper-field layouts where flow balancing is required by the field design.

    You will need one less flow restrictor than your total number of runs, as the last run is non-restricted.
    Why choose this accessory

    Flow control for sloping dripper fields

    • Designed for downhill GreyFlow™ feeder-pipe runs where the slope exceeds 3°.
    • Helps support balanced flow across dripper-field runs on sloping sites.
    • Includes the core barb fittings, clips and in-line brass sprung check valve.
    • Used as part of suitable GreyFlow™ GWDD dripper-field designs.
    Package details

    What is included

    Barb fittings
    2 x 25mm barb fittings, pre-fitted.
    Clips
    2 x 25mm clips.
    Valve
    1 x in-line brass sprung check valve.
    Application note

    How many restrictors are required?

    For downhill dripper-field runs, the usual rule is to use one less flow restrictor than the total number of runs, because the final run is non-restricted.

    Example: if the field has 7 runs, 6 flow restrictors are typically required.
    WCTNZ® support

    GreyFlow™ product guidance

    WCTNZ® supplies GreyFlow™ greywater products in New Zealand with local product knowledge, documentation support and practical guidance for system selection and site fit.

    WCTNZ® is the exclusive authorised distributor of GreyFlow™ greywater systems in New Zealand. All GreyFlow™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties and are supported locally by WCTNZ®.
    Copyright © 2026 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: May 26, 2026

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