Prevent a block with a fluid tank from accepting fluid

I'm making a machine that produces a fluid from processing an item, so I want to have an internal tank fill with the fluid as each item is processed. Once the fluid is generated, I want the player to be able to extract the fluid (easy enough), but I don't want the block to be able to accept fluids from an external source. Is there a way to do this?

I'm using MCreator 2023.2 for 1.19.2