They regulate flow through pipes by opening or closing an aperture

Let's find possible answers to "They regulate flow through pipes by opening or closing an aperture" crossword clue. First of all, we will look for a few extra hints for this entry: They regulate flow through pipes by opening or closing an aperture. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.