According to one embodiment, a method for switching operating carrier at a user equipment includes receiving a message including a carrier index of a target carrier for a current primary carrier change from a base station. The pressure relief of the control chamber is controlled via an externally actuatable actuator. Embodiments include, without limitation, single-walled pipe, pipe formed from multiple material layers, corrugated pipe, flat-walled pipe, and others. , a first and second layer, is filled with media. The interpoles are disposed in the housing. The invention relates furthermore to the dispersion produced with this method.