Basement sealing and suction ventilation reduce exposure. Reed organs are operated either with pressure or with suction bellows. The suction and discharge valves are mounted in the head of the cylinder. The vitrector has a reciprocating cutting tip attached to a suction device. Industrial grippers may employ mechanical, suction or magnetic means. Function of an NG tube properly placed and used for suction is maintained by flushing. Q at ejector suction and Q is the motive steam quantity. The endoscope has a movable tip and multiple channels for instrumentation, air, suction and light. The third chamber is the suction control chamber. This can be done by either Ekman suction or Ekman pumping depending on wind patterns. There are three major wind patterns that lead to Ekman suction or pumping. Until the 1970s, biopsies were obtained using metal capsules attached to a suction device. Dredges have been classified as suction or mechanical. They possess a unique feeding mechanism among cetaceans known as suction feeding. Examples of this include directed wound irrigation and therapeutic irrigation with suction.