A device with an orifice installed in a line to restrict the flow of fluids. Chokes are also used to control the rate of flow of the drilling mud out of the hole when the well is closed in with the blowout preventer and a kick is being circulated out of the hole. See Adjustable choke, Blowout preventer, Bottomhole choke, Christmas tree, Kick, Nipple, Positive choke.