The pipe connected to the ram preventer through which fluid influxes are circulated out when a well kick is detected. It is connected to a choke manifold comprising adjustable choke valves, fittings and lines to direct the fluids either to the mud pit or to a flare line.
The choke line controls the rate of drilling fluid flow out of a well when the blowout preventers are closed and a kick is being circulated out of the well.