ModsJava
Refined Fluid Substitution
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on Modrinth
This mod adds a fluid substitution pattern, allowing fluids to be used directly instead of buckets to Refined Storage.
Simply encode a recipe as you normally would, but use a Fluid Substitution Pattern instead of a regular pattern. 
Then insert the encoded pattern into an Autocrafter: 
That's it! When you request the craft, Refined Storage can now use the fluid directly instead of filled buckets.
Recipe:
Spoiler
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as refinedfluidsubstitution-fabric-1.21.1-2.0.0.jar — drop this file into the mods folder
- Download size: 41 KB
- Download link checked 2 Oct 2026 — working
These come from our own check of the pack file, not from the source page.