If you find your central vacuum is too loud a Sound Off muffler can help. Simply attach the muffler onto the exhaust port on the central vacuum power unit. The foam and insulation inside of the muffler will absorb the sound waves and work to reduce the noise. The Sound Off Muffler has an increased amount of insulation compared to the standard central vacuum muffler. The muffler is compatible with all central vacuum units that have a 2" diameter exhaust port. All instillation material is included.