I'm writing about the structure of a reaction vessel used in scientific labs. The vessel has a large container equipped with another component. This another component is used for taking a small amount of the content of the container. The content is a liquid mixture. The component is not a sampler; it is for transferring the small amount to the next step of reaction.
I need to name the component. The name should be a single phrase, something like "...ing component" or "...er" (like "dividing component""divider").
Does anybody have a good idea for this?? Thank you!