JustPump
JustPump is a NeoForge technology mod for 1.21.1 that adds a pump module for extracting and filling fluids from the blocks and tanks around it.
What it does
The pump module can work in an automatic mode, where it has to be placed above the fluid it draws from. Its scan step lets a player click Scan to find the positions where extractable fluid sits, and the output then runs through a pipeline to a connected storage container.
A second mode extracts from a chosen liquid range. Its radii along the X, Y and Z axes are set directly, offset values can shift the area, and a Display Range button shows the area before scanning. Once the scan completes, output follows the same pipeline route as the automatic mode.
A filling mode works much like extraction, but it needs a fluid input connected to the pump, and it places fluid into the scanned positions. Installation needs NeoForge and a NeoForge build for 1.21.1; the mod runs on client and server, so the server and every player need it. The code is under the MIT License and is open source.
Key features
Automatic extraction
The pump module draws fluid from the position it is placed over, found through a scan step.
Range-based extraction
A chosen box of space is scanned for extractable fluid, with radii set along the X, Y and Z axes.
Filling mode
The pump can place fluid into scanned positions, using a fluid input connected to the pump.
Pipeline output
Extracted or filled fluid is routed through a connected pipeline to a storage container.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Collecting fluid from a field
A player sets a range over a wide area and scans it, so extractable fluid can be gathered into one storage container.
Who it’s for: Players building fluid pipelines in technology-focused 1.21.1 worlds, and server owners who want a pump that works on the server side as well as the client.
How it compares
Create: Pipes'n physics is also a NeoForge mod for 1.21.1 under the MIT License, and is open source. Create: Liquid Blueprints is open source under the GNU General Public License v3.0 only, for the same 1.21.1 build. Mechanical Pump is not open source, is licensed as All rights reserved, and covers 1.21 – 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JustPump | NeoForge | 1.21.1 | Client and server | 2026-03-02 |
| Create: Pipes'n physics | NeoForge | 1.21.1 | Client and server | 2026-09-10 |
| Create: Liquid Blueprints | NeoForge | 1.21.1 | Client and server | 2026-08-14 |
| Mechanical Pump | NeoForge | 1.21 – 1.21.1 | Client and server | 2026-03-29 |
Questions
Does JustPump need to be installed on the server?
What is the difference between the automatic and range modes?
Does filling mode need a separate input?
In the catalog
JustPump is one of 8,499 Technology mods on ModsFinder, and one of 3,557 Technology mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from Flandre923-Unit-01
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What the author says
You can use copper blocks, kelp blocks, and bamboo for synthesis. When in the auto mode, you need to place the machine above the fluid. Then click "Scan" to obtain the position of the extractable fluid. After that, use a pipeline for active output and connect it to the corresponding fluid - storage container, and…
Official listing
- Modrinth page
- modrinth.com/mod/justpump
- Owner
- Flandre923-Unit-01
- Published
- 2025-02-11
- Updated on Modrinth
- 2026-03-02
- Facts verified
- 2026-10-15