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What is a "needle valve"?

My husband is kind of a handyman. Whenever and whatever that´s broken he can fix it. And if he can´t he will learn. Right now he is mending some pipes that goes to some vaacum tube. And he needs me to go out and buy him a "needle valve".

 I have no idea what that is but appearently it allows precise regulation of flow and that seems important when you are dealing with gas! it is a small piece of metal that looks almost like a key. So I´m going to the hardwarestore to pretend that I know exactly what I´m talking about. I hate to seem lika a goose!