Metacaulk COVER GUARD MetacaulkĀ® COVER GUARD⢠isna single component fire rated gasket for use with electrical boxes when addressing the “24 inch rule”. Technical Data Sheet : English Category: Metacaulk Related products MetacaulkMetacaulk Composite Sheet Read more MetacaulkMetacaulk Fire Rated Mortar Read more MetacaulkMetacaulk 835+ Read more