It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.capability.IFluidHandlerItem;

IFluidHandlerItem implements the following interfaces. That means all methods defined in these interfaces are also available in IFluidHandlerItem

• IFluidHandler

Name	Type	Has Getter	Has Setter	Description
Name container	Type ItemStack	Has Getter true	Has Setter false	Description Gets the container of this handler.