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The article describes the change in temperature inside the elastic element when the pressure changes.These flexible elements are used in flexible pneumatic couplings developed at our workplace and are pressurized by a certain value of pressure depending on the transmitted torque.We test the given elements on a test rig designed at our workplace. I will describe this device in detail in this article.On this device we test these elastic elements at different pressures. We find out how much influence the pressure value in the elastic element has on the change of temperature inside the element. We will find out whether the change in pressure also has a significant effect on the change in temperature and whether this temperature also affects the functionality of the device in which these elements are used.