Details
Biostop® Firestop Gasket is a single component, fire-rated gasket for use with
electrical boxes to comply with the "24 inch rule". Biostop® Firestop Gaskets fit
under the cover plate and do not take up volume in the electrical box. It is a labor
saving replacement for putty pads in normal applications. STC rating 54, Tested in a UL
411 wall assembly/section to ASTM E90. Patent #6,207,085