the embodiment described above in this design however the conduit 5 is enclosed in the circumferential direction by an inner wall which is elastically expandable in its entirety and surrounds the outside of metallic support 16 in a spiral manner the length of the conduit 5 thereby is relatively great this helps attain the waveguide function which is of importance to the invention the remaining details of this embodiment may correspond to the above described embodiment fig4 depicts an embodiment of a conduit 5 that may be used in the rubber bearing of the invention it is elastically expandable over its entire circumference and is made of an elastomeric material the conduit is bounded on the inside and outside by exponential funnel shaped surfaces 14 15 which are rectified and arranged concentrically to each other starting from the inlet cross section 11 the thickness d of the inner wall is continuously reduced in the direction of the outlet at the narrowest location 12 of the conduit 5 this causes high frequency pressure changes in the working chamber in the conduit 5 bordering the inlet cross section to be transformed into compressional waves which spread out in a linear fashion in the direction of the outlet cross section 12 of the conduit and thus in the direction of the damping element not shown arranged at the outlet in which a reflection free absorption of the.