Is it possible to soundproof a door with a mail slot?

door mail slot blocker
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Find a complete selection of specialized and decorative hardware for the glass, window, and door industry

door slot MSB-28 MAIL SLOT BLOCK,SOLID ALUMINUMPR ELEC

door with mail slot Most traditional British pillar boxes produced after 1905 are made of cast iron ; The door contains the aperture or posting slot It is hinged, should display