Patent ID: 8162102

Claim:
A vacuum waste-water system sound-absorber comprising: an aspiration air duct; wherein the aspiration air duct is radially delimited by a pipe, wherein the pipe is delimited at an interior of the aspiration air duct by an internal wall and is delimited at an exterior of the aspiration air duct by an external wall; wherein the internal wall comprises openings in a radial direction; wherein the external wall comprises openings in a radial direction; wherein a sound-absorbent material is arranged between the internal wall and the external wall; and wherein the openings of the internal wall have a segment-shaped design, wherein the openings of the external wall have a segment-shaped design, and wherein in the sound-absorbent material includes continuous recesses arranged in a radial direction, each recess corresponding to an opening of the internal pipe and an opening of the external pipe.