The agent has a base body (9) with a membrane bed and a pressure measuring device. A membrane is arranged before the bed. An inner area of the membrane receives two different axial resting positions, in which the bed is not filled with a pressurizing agent fluid, and the agent is filled with a preset quantity of fluid in an operating condition so that an inner membrane surface is provided between two axial adjacent resting positions. Independent claims are also included for the following: (1) a membrane for a pressure agent (2) a method for producing a pressure agent membrane.
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