The sound enclosure reduces the noise for quieter blending.
The housing comes with sound dampening foam and sound blocks.
These parts fit the commercial Connoisseur 825 (previously know as Q-Series.) and the home version Professional 750
Also fits the Space Saver 825 if the unit is counter-sunk. If upgrading from Space Saver 825 to Connoisseur 825, both parts are needed if you wish to use it free-standing.