Flopper
A hopper for transferring fluids
About this Mod
We've had to suffer long enough in our early-game fluid transfer endeavours...
Here's the Flopper, a Fluid Hopper!
The Flopper is an early-game block to move around fluids, just like the Hopper does for items.
It is able to take in fluids from the top (either from a tank, or from the world), and push it to the target side (either to a tank, or to the world).

Tanks will always have a preference over world-interaction.
Note: Tanks are not included in this mod, those are Dark Tanks from EvilCraft.
A simple, early-game recipe.

This block has no GUI, because who needs GUIs anyways? Instead, you can right click on the block to display contents. The contained fluid will also be rendered dynamically (can be disabled).
You can also right-click to insert fluids from any fluid tank item, or extract by shift+right-clicking.

And yes, the Flopper has proper bounding boxes that allow you to click on blocks behind it.

Just like the regular Hopper, you can disable it using a redstone signal.

Everything ranging from the input fluid rate to the cooldown duration for world-interaction can be configured in this mod! Here's an excerpt from the config file:
machine {
# The maximum capacity in mB.
I:flopper.capacityMb=5000
# If the collision boxes should be made smaller to allow clicking behind the flopper.
B:flopper.narrowCollision=true
# The rate at which fluids can be pulled from other tanks.
I:flopper.pullFluidRate=100
# If fluids should be pulled from the world.
B:flopper.pullFluidsWorld=true
# The rate at which fluids can be pushed to other tanks.
I:flopper.pushFluidRate=100
# If fluids should be pushed into the world.
B:flopper.pushFluidsWorld=true
# If the contained fluid should be rendered.
B:flopper.renderFluid=true
# The number of ticks each flopper should sleep after interacting with tanks
I:flopper.workCooldown=8
# The number of ticks each flopper should sleep after picking up or placing fluids.
I:flopper.workWorldCooldown=20
# If neighbour-change events should be triggered when placing or picking up fluids to/from the world.
B:flopper.worldPullPushNeighbourEvents=true
# If sounds should be placed when placing or picking up fluids to/from the world.
B:flopper.worldPullPushSounds=true
}
This mod was inspired by the pre-1.12 Funnels mod.
This mod collects anonymized startup data, this can be disabled in the config file and adheres to Minecraft's snooper settings.
If you like this mod, consider supporting me on Patreon!
Available Versions
How to Install Flopper on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.1.2).
Install Mod
Open the mod browser in the dashboard and search for "Flopper". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1.2, 26.1.1, 1.21.11 (+14 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Flopper server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.1.2). You can switch loaders with one click in the panel.
Is Flopper compatible with fabric and forge and neoforge and quilt?
Flopper officially supports fabric, forge, neoforge, quilt for Minecraft 26.1.2, 26.1.1, 1.21.11. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Flopper – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Flopper consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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