Metacaulk COVER GUARD MetacaulkĀ® COVER GUARDā¢ 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 Firestop Pillows Read more MetacaulkMetacaulk 1000 Read more MetacaulkMetacaulk BlazeSeal Read more