Used in a [[stuffing box]] and [[hydraulic packing head]]. Rubber seals that can be squeezed down over logging [[cable]] to form a pressure seal in the event pressure develops at the surface. Cable can be moved in closed down glands if the cable is lubricated by fluid or injected grease. If glands should cut out, the [[blowout preventer]] can be closed and glands replaced. Compare [[rams]].