Granzon 100mm Reservoir/PWM DDC Pump Combo, Digital Display(GFMB-100)
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Granzon 100mm Reservoir/PWM DDC Pump Combo, Digital Display(GFMB-100)

GFMB-100 Only 3 left in Boise, ID
$221.99USDFree shipping, lower 48

US import duties and tariffs are included in every price.

Ships the same business day on orders placed before 2:00 PM MST. Overnight delivery available at checkout.
Ships directly from our Idaho inventory. You avoid overseas sellers, processing delays, international shipping, customs hold-ups and additional fees.
What this works with

Check these against your build before you order. If anything here does not match what you have, ask us first — it is cheaper than a return.

  • Fitting: G 1/4in. Thread
    • Not sure? Send us your model/part number and we'll confirm it for you.
    or ready to checkout now
    Building your first loop? Plan the rest of it
    Why buy it here
    US warranty, handled in Boise
    Claims are settled here, by the people who sold it to you.
    Exclusive US distributor
    The official US source for Bykski, so every part is genuine.

    Before you install it

    This is a component, not an assembly — how it goes in depends on the loop it is joining. What does not change is the last step: leak test before power. Run the pump on a bench supply with the rest of the system unpowered. 24 hours is the standard, an hour is the minimum.

    Custom water cooling is installed by you, at your own risk. We are not responsible for leaks, or for damage to your parts or system. If you're unsure at any step, ask before you power the loop.

    About this part

    This Granzon Reservoir/PWM DDC Pump Combo has multiple digital display read outs. Highlighting the display readouts is a tachometer design, real time display of pump speed. Speed control can be set manually in increments of 100. Automatic mode is also available when using your motherboards PWM header. Flow rates, voltage and load are displayed as well for a complete overview of your pumps performance. Keep in mind the flow rate is based on the pump speed. This means the lower your loop resistance the more accurate the reading will be. For most applications it will be a very accurate simulation. The pump is ready to use with a POM body encasing the pump. The top is threaded for instant reservoir tube adaptation and are available in multiple lengths.

    In the box
  • 4x Mount Screws
  • 1x DDC Pump w/ housing
  • Reservoir top/tube
    • If the gallery shows a parts diagram, that diagram is the source of truth for what ships.
    Datasheet
    MaterialPOM / Aluminum (not in contact with coolant)
    Pump CoreCP-D3PB-X
    RPM1800-4800
    Temperature45°C @ 4000RPM
    PowerDC12v
    Flow Rate700L/h
    Head6M
    Connector4-Pin Molex and PWM+ data feedback
    Inlets2
    Outlets1
    SKUGFMB-100

    What buyers said

    Left by people who bought this part here. Compatibility reports are the useful ones — if you fitted it, say which board.

    Customer Reviews

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    Questions people ask about this part

    Answers specific to GFMB-100. If yours isn't here, ask — we'd rather talk you out of the wrong part than sell you one.

    What does this part fit?
    This part is specified by what it connects to, not by a card model:
  • Fitting: G 1/4in. Thread

    • Check those against your build before you order. If anything does not match, ask us first — it is cheaper than a return. Part number GFMB-100.

    Is it in stock, and when will it ship?
    Yes — only 3 left in Boise, Idaho. Orders placed before 2:00 PM MST on a business day ship the same day — we do not ship weekends or US holidays. Overnight delivery is available at checkout.
    Can I return it if it turns out not to fit?
    Yes. Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used. So we would rather check the fit with you first: send us the model and we will check it against this part.
    Will I pay import duties or customs charges on delivery?
    Not on a US order. US import duties and tariffs are already included in the price, so nothing is collected at the door and there is no brokerage fee. Orders shipped outside the US may owe that country's customs fees and duties.
    Who handles the warranty?
    BYKSKI.US, the exclusive US distributor, from Boise, Idaho. Claims are handled domestically rather than returned to an overseas factory. Installation is at your own risk: we are not responsible for leaks or damage to other hardware.
    Is shipping free?
    Yes — shipping is included at this price for addresses in the lower 48 US states.
    Are printed instructions included?
    No printed manual is included. Installation references are in the product gallery images, and the install guides on this site cover the process step by step.
    Do I need anything else to use it?
    Check the parts list above against what you already have. If you are building a loop from scratch, send us the full parts list and we will tell you what is missing before you order.

    Ask us before you order

    Send your exact hardware model and we'll confirm the right part before you spend $221.99 — or tell you honestly that this isn't the one.

    Returns are accepted within 30 days and are easy to start in the support center. Unopened items can be returned for store credit with no restocking fee; other returns carry a restocking fee, higher for items that have been installed or used.

    Ask about compatibility