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STI Firestop Closet Flange Firestop Gasket - 3” or 4” (76 or 102 mm) trade size closet flange gasket

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SpecSeal Closet Flange Firestop Gaskets are a one-piece, molded rubber, intumescent pad that installs beneath a 3” or 4” (76 or 102 mm) closet flange to effectively firestop the opening. The die cut rubber gasket is perforated to delineate removable inserts sized to accommodate various outer diameters of toilet flanges.

Traditional firestop methods require the firestop material to be applied around the pipe prior to setting the flange. If the firestop material is not sufficiently recessed, the flange will not fit.

The alternative is to apply the firestop material from the bottom. This necessitates the use of ladders, costly lifts, and more labor.

  • Seamless fit for fast, easy installation with no tools required
  • Lower installed cost
  • Foolproof installations
  • Work from the top, not from a lift below the floor
  • No caulk to clean up
  • Always ready to use. No shelf life. No caulk tubes to dry out
  • UL Classified. Code compliant