If you replace the "storage.fluid.getFluidID()" calls with "storage.fluid.getFluid().getID()", that should allow pre-fluid change forge versions to work as well as keeping the post-fluid change ones working. I'd make a pull request myself but I'm not sure if you've added any more newer Forge dependencies.

We're probably going to push users to use the (new) recommend Forge, so...

Test

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