Inflatable seals are elastomeric tubes designed to round out with the introduction of a medium (usually air) to form an tight barrier between a mounting and striking surface.
O-rings are solid-rubber seals that are shaped like a doughnut. When pressed between two mating surfaces, O-rings block the passage of liquids or gases.
Tubing is used to transport fluid and gas in pneumatic, hydraulic, or process applications. Tubing differs from pipe in that tubing's outside diameter or size is controlled and used for product designation.