A pressure-control fitting which attaches to the top of [[riser]] equipment. Contains rubber [[glands]] which can be closed down around [[survey cable]] to form a fit capable of withstanding low pressures at the wellhead. Cable can be moved when glands are closed down on the cable. When glands cut out under pressure, the [[blowout preventer]] can be closed on the line and the glands replaced. Compare [[hydraulic packing head]].