Flopper
by rubensworks
Flopper, a utility mod by rubensworks, adds a fluid hopper that moves fluids between tanks and the world the way a regular hopper moves items.
What it does
The Flopper Fluid Hopper takes fluids from the top of a tank and pushes them into a tank on any side. Tanks take priority over world interaction, and tanks from the Dark Tanks mod and EvilCraft are included. Like a regular hopper, it stops when a redstone signal reaches it.
The input fluid rate, the cooldown duration and the world interaction can all be changed in the config file, and an excerpt of that file is in the mod's documentation. Flopper requires Cyclops Core, and Forge Config API Port is an optional dependency. The mod is published for Fabric, Forge, NeoForge and Quilt, with files for 1.18.2 – 26.3, and the environment is client and server, so the server and every player need it.
The mod is open source under the MIT License and its source code and issue tracker are public. The current files are version 26.3-1.1.9-257, released 2026-09-21 on the beta channel. The project was first published on 2022-06-05.
Key features
Fluid hopper block
A hopper for fluids moves liquid between tanks, so early-game fluid transfer does not need manual pipes.
Tank-first transfer
Adjacent tanks receive fluid before the world is used, and fluids can be taken from the top of a tank.
Redstone control
Like a regular hopper, the fluid hopper stops when a redstone signal is applied to it.
Configurable rates
Input rate, cooldown and world interaction can be set in the config file.
Compatibility
Latest build for each game version and loader.
26.x4 of 4 versions with builds
1.21.x8 of 8 versions with builds
1.20.x2 of 2 versions with builds
1.19.x4 of 4 versions with builds
1.18.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
Use cases
Early-game fluid setups
Players moving water or lava between tanks before building larger systems can use the fluid hopper in place of manual transfer.
Who it’s for: Players who want hopper-style fluid transfer, and server owners who want to tune transfer rates through the config file.
Questions
Does Flopper need Cyclops Core?
Does Flopper have to be installed on both sides?
Which loaders does Flopper support?
In the catalog
Flopper is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 8,071 mods support Minecraft 26.3.
More from rubensworks
Similar mods
What the author says
This mod requires the Cyclops Core library! We've had to suffer long enough in our early-game fluid transfer endeavours... Here's the Flopper, a Fluid Hopper!
Official listing
- Modrinth page
- modrinth.com/mod/flopper
- Owner
- rubensworks
- Published
- 2022-06-05
- Updated on Modrinth
- 2026-09-21
- Facts verified
- 2026-10-15