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This article is part of a series on the Fabric Transfer API. Link to the home page of the series.

Storage<FluidVariant> is a thing that contains fluids, it is what tanks, buckets, etc… implement and it is what pipe mods and others use to move fluids between containers.

Now that you implemented a simple tank, let's have a look at what exactly this SingleVariantStorage<FluidVariant> is.

public abstract class SingleVariantStorage<T extends TransferVariant<?>> extends ... implements SingleSlotStorage<T> { ... }
public interface SingleSlotStorage<T> extends Storage<T>, ... { ... }

The takeaway here is that SingleVariantStorage<FluidVariant> is a Storage<FluidVariant>, which is what we registered to FluidStorage.SIDED!

Let's see how we can retrieve one from the world:

World world = ...; // Important: must be a server world!!! You must never query this on the client.
BlockPos pos = ...; // The postion in the world
Direction direction = ...; // The side for which we want a storage.
@Nullable
Storage<FluidVariant> storage = FluidStorage.SIDED.find(world, pos, direction);
 
if (storage != null) {
	// Use the storage
}

Let's have a look at Storage.java:

public interface Storage<T> {
	// Insert a resource in the storage.
	long insert(T resource, long maxAmount, TransactionContext transaction);
	// Extract a resource from the storage.
	long extract(T resource, long maxAmount, TransactionContext transaction);
	// Iterate over the contents of this storage.
	default Iterable<StorageView<T>> iterable(TransactionContext transaction) { ... }
 
	...