Do all toilet refill valve use a refill tube?

Not all toilet refill valves use a refill tube. While many traditional models do incorporate a refill tube to direct water into the toilet bowl after flushing, some modern designs, such as integrated fill valves, may not require a separate refill tube. Instead, they can provide water directly to the bowl through their design. It's important to check the specific type of valve in use for its features and installation requirements.